| **Investments in Marketable Securities (Naratives) (Details) (USD $)In Millions, unless otherwise specified** | Dec. 31, 2013 | Mar. 31, 2013 |
|---------------------------------------------------------------------------------------------------------------|---------------|---------------|
| **Schedule of Available-for-sale Securities [Line Items]**                                                    |          |          |
| Due in 1 Year or Less, Amount                                                                                 | $ 1,670       |          |
| Due after 1 Year through 5 Years, Amount                                                                      | 122           |          |
| Due after 5 Years through 10 Years, Amount                                                                    | 102           |          |
| Due after 10 Years, Amount                                                                                    | 163           |          |
| Total, fair value                                                                                             | 4,450         | 5,397         |
| Due in 1 Year or Less, Yield                                                                                  | 0.31%         |          |
| Due after 1 Year through 5 Years, Yield                                                                       | 2.62%         |          |
| Due after 5 Years through 10 Years, Yield                                                                     | 3.15%         |          |
| Due after 10 Years, Yield                                                                                     | 3.75%         |          |
| Total, Yield                                                                                                  | 3.24%         |          |
| Due in 1 Year or Less, Amortized Cost                                                                         | 1,670         |          |
| Due after 1 Year through 5 Years, Amortized Cost                                                              | 119           |          |
| Due after 5 Years through 10 Years, Amortized Cost                                                            | 104           |          |
| Due after 10 Years, Amortized Cost                                                                            | 162           |          |
| Amortized cost                                                                                                | 4,137         | 5,057         |
| Debt securities on deposit with state insurance authorities                                                   | 6             | 6             |
| Debt securities with amortized cost on deposit with state insurance authorities                               | 6             | 6             |
| Fixed income mutual funds [Member]                                                                            |          |          |
| **Schedule of Available-for-sale Securities [Line Items]**                                                    |          |          |
| Total, fair value                                                                                             | 1,900         | 2,000         |
| Debt instruments [Member]                                                                                     |          |          |
| **Schedule of Available-for-sale Securities [Line Items]**                                                    |          |          |
| Due in 1 Year or Less, Amount                                                                                 | 1,670         |          |
| Due after 1 Year through 5 Years, Amount                                                                      | 122           |          |
| Due after 5 Years through 10 Years, Amount                                                                    | 102           |          |
| Due after 10 Years, Amount                                                                                    | 163           |          |
| Total, fair value                                                                                             | 2,057         |          |
| Due in 1 Year or Less, Yield                                                                                  | 0.31%         |          |
| Due after 1 Year through 5 Years, Yield                                                                       | 2.62%         |          |
| Due after 5 Years through 10 Years, Yield                                                                     | 3.15%         |          |
| Due after 10 Years, Yield                                                                                     | 3.75%         |          |
| Total, Yield                                                                                                  | 0.86%         |          |
| Debt instruments [Member] | U.S. government and agency obligations [Member]                                   |          |          |
| **Schedule of Available-for-sale Securities [Line Items]**                                                    |          |          |
| Due in 1 Year or Less, Amount                                                                                 | 0             |          |
| Due after 1 Year through 5 Years, Amount                                                                      | 65            |          |
| Due after 5 Years through 10 Years, Amount                                                                    | 21            |          |
| Due after 10 Years, Amount                                                                                    | 1             |          |
| Total, fair value                                                                                             | 87            | 104           |
| Due in 1 Year or Less, Yield                                                                                  | 0.00%         |          |
| Due after 1 Year through 5 Years, Yield                                                                       | 1.50%         |          |
| Due after 5 Years through 10 Years, Yield                                                                     | 1.61%         |          |
| Due after 10 Years, Yield                                                                                     | 3.57%         |          |
| Total, Yield                                                                                                  | 1.55%         |          |
| Amortized cost                                                                                                | 87            | 101           |
| Debt instruments [Member] | Municipal debt securities [Member]                                                |          |          |
| **Schedule of Available-for-sale Securities [Line Items]**                                                    |          |          |
| Due in 1 Year or Less, Amount                                                                                 | 2             |          |
| Due after 1 Year through 5 Years, Amount                                                                      | 0             |          |
| Due after 5 Years through 10 Years, Amount                                                                    | 1             |          |
| Due after 10 Years, Amount                                                                                    | 11            |          |
| Total, fair value                                                                                             | 14            | 16            |
| Due in 1 Year or Less, Yield                                                                                  | 2.39%         |          |
| Due after 1 Year through 5 Years, Yield                                                                       | 0.00%         |          |
| Due after 5 Years through 10 Years, Yield                                                                     | 5.57%         |          |
| Due after 10 Years, Yield                                                                                     | 5.69%         |          |
| Total, Yield                                                                                                  | 5.18%         |          |
| Amortized cost                                                                                                | 14            | 14            |
| Debt instruments [Member] | Certificates of deposit [Member]                                                  |          |          |
| **Schedule of Available-for-sale Securities [Line Items]**                                                    |          |          |
| Due in 1 Year or Less, Amount                                                                                 | 1,533         |          |
| Due after 1 Year through 5 Years, Amount                                                                      | 0             |          |
| Due after 5 Years through 10 Years, Amount                                                                    | 0             |          |
| Due after 10 Years, Amount                                                                                    | 0             |          |
| Total, fair value                                                                                             | 1,533         | 2,041         |
| Due in 1 Year or Less, Yield                                                                                  | 0.29%         |          |
| Due after 1 Year through 5 Years, Yield                                                                       | 0.00%         |          |
| Due after 5 Years through 10 Years, Yield                                                                     | 0.00%         |          |
| Due after 10 Years, Yield                                                                                     | 0.00%         |          |
| Total, Yield                                                                                                  | 0.29%         |          |
| Amortized cost                                                                                                | 1,533         | 2,040         |
| Debt instruments [Member] | Commercial paper [Member]                                                         |          |          |
| **Schedule of Available-for-sale Securities [Line Items]**                                                    |          |          |
| Due in 1 Year or Less, Amount                                                                                 | 125           |          |
| Due after 1 Year through 5 Years, Amount                                                                      | 0             |          |
| Due after 5 Years through 10 Years, Amount                                                                    | 0             |          |
| Due after 10 Years, Amount                                                                                    | 0             |          |
| Total, fair value                                                                                             | 125           | 495           |
| Due in 1 Year or Less, Yield                                                                                  | 0.23%         |          |
| Due after 1 Year through 5 Years, Yield                                                                       | 0.00%         |          |
| Due after 5 Years through 10 Years, Yield                                                                     | 0.00%         |          |
| Due after 10 Years, Yield                                                                                     | 0.00%         |          |
| Total, Yield                                                                                                  | 0.23%         |          |
| Amortized cost                                                                                                | 125           | 495           |
| Debt instruments [Member] | Foreign government debt securities [Member]                                       |          |          |
| **Schedule of Available-for-sale Securities [Line Items]**                                                    |          |          |
| Due in 1 Year or Less, Amount                                                                                 | 3             |          |
| Due after 1 Year through 5 Years, Amount                                                                      | 0             |          |
| Due after 5 Years through 10 Years, Amount                                                                    | 0             |          |
| Due after 10 Years, Amount                                                                                    | 0             |          |
| Total, fair value                                                                                             | 3             | 3             |
| Due in 1 Year or Less, Yield                                                                                  | 2.93%         |          |
| Due after 1 Year through 5 Years, Yield                                                                       | 0.00%         |          |
| Due after 5 Years through 10 Years, Yield                                                                     | 0.00%         |          |
| Due after 10 Years, Yield                                                                                     | 0.00%         |          |
| Total, Yield                                                                                                  | 2.93%         |          |
| Amortized cost                                                                                                | 3             | 3             |
| Debt instruments [Member] | Corporate debt securities [Member]                                                |          |          |
| **Schedule of Available-for-sale Securities [Line Items]**                                                    |          |          |
| Due in 1 Year or Less, Amount                                                                                 | 7             |          |
| Due after 1 Year through 5 Years, Amount                                                                      | 49            |          |
| Due after 5 Years through 10 Years, Amount                                                                    | 71            |          |
| Due after 10 Years, Amount                                                                                    | 26            |          |
| Total, fair value                                                                                             | 153           | 128           |
| Due in 1 Year or Less, Yield                                                                                  | 4.14%         |          |
| Due after 1 Year through 5 Years, Yield                                                                       | 4.31%         |          |
| Due after 5 Years through 10 Years, Yield                                                                     | 3.55%         |          |
| Due after 10 Years, Yield                                                                                     | 4.39%         |          |
| Total, Yield                                                                                                  | 3.97%         |          |
| Amortized cost                                                                                                | 151           | 122           |
| Debt instruments [Member] | U.S. government agency mortgage-backed securities [Member]                        |          |          |
| **Schedule of Available-for-sale Securities [Line Items]**                                                    |          |          |
| Due in 1 Year or Less, Amount                                                                                 | 0             |          |
| Due after 1 Year through 5 Years, Amount                                                                      | 0             |          |
| Due after 5 Years through 10 Years, Amount                                                                    | 4             |          |
| Due after 10 Years, Amount                                                                                    | 60            |          |
| Total, fair value                                                                                             | 64            | 87            |
| Due in 1 Year or Less, Yield                                                                                  | 0.00%         |          |
| Due after 1 Year through 5 Years, Yield                                                                       | 0.00%         |          |
| Due after 5 Years through 10 Years, Yield                                                                     | 3.91%         |          |
| Due after 10 Years, Yield                                                                                     | 3.24%         |          |
| Total, Yield                                                                                                  | 3.28%         |          |
| Amortized cost                                                                                                | 64            | 83            |
| Debt instruments [Member] | Non-agency residential mortgage-backed securities [Member]                        |          |          |
| **Schedule of Available-for-sale Securities [Line Items]**                                                    |          |          |
| Due in 1 Year or Less, Amount                                                                                 | 0             |          |
| Due after 1 Year through 5 Years, Amount                                                                      | 0             |          |
| Due after 5 Years through 10 Years, Amount                                                                    | 0             |          |
| Due after 10 Years, Amount                                                                                    | 5             |          |
| Total, fair value                                                                                             | 5             | 5             |
| Due in 1 Year or Less, Yield                                                                                  | 0.00%         |          |
| Due after 1 Year through 5 Years, Yield                                                                       | 0.00%         |          |
| Due after 5 Years through 10 Years, Yield                                                                     | 0.00%         |          |
| Due after 10 Years, Yield                                                                                     | 10.17%        |          |
| Total, Yield                                                                                                  | 10.17%        |          |
| Amortized cost                                                                                                | 4             | 4             |
| Debt instruments [Member] | Non-agency commercial mortgage-backed securities [Member]                         |          |          |
| **Schedule of Available-for-sale Securities [Line Items]**                                                    |          |          |
| Due in 1 Year or Less, Amount                                                                                 | 0             |          |
| Due after 1 Year through 5 Years, Amount                                                                      | 3             |          |
| Due after 5 Years through 10 Years, Amount                                                                    | 1             |          |
| Due after 10 Years, Amount                                                                                    | 46            |          |
| Total, fair value                                                                                             | 50            | 51            |
| Due in 1 Year or Less, Yield                                                                                  | 0.00%         |          |
| Due after 1 Year through 5 Years, Yield                                                                       | 1.87%         |          |
| Due after 5 Years through 10 Years, Yield                                                                     | 3.64%         |          |
| Due after 10 Years, Yield                                                                                     | 3.35%         |          |
| Total, Yield                                                                                                  | 3.29%         |          |
| Amortized cost                                                                                                | 51            | 50            |
| Debt instruments [Member] | Asset-backed securities [Member]                                                  |          |          |
| **Schedule of Available-for-sale Securities [Line Items]**                                                    |          |          |
| Due in 1 Year or Less, Amount                                                                                 | 0             |          |
| Due after 1 Year through 5 Years, Amount                                                                      | 5             |          |
| Due after 5 Years through 10 Years, Amount                                                                    | 4             |          |
| Due after 10 Years, Amount                                                                                    | 14            |          |
| Total, fair value                                                                                             | 23            | 13            |
| Due in 1 Year or Less, Yield                                                                                  | 0.00%         |          |
| Due after 1 Year through 5 Years, Yield                                                                       | 0.75%         |          |
| Due after 5 Years through 10 Years, Yield                                                                     | 1.87%         |          |
| Due after 10 Years, Yield                                                                                     | 2.54%         |          |
| Total, Yield                                                                                                  | 1.97%         |          |
| Amortized cost                                                                                                | 23            | 13            |
| Equity instruments [Member]                                                                                   |          |          |
| **Schedule of Available-for-sale Securities [Line Items]**                                                    |          |          |
| Total, fair value                                                                                             | 2,393         |          |
| Total, Yield                                                                                                  | 5.28%         |          |
| Equity instruments [Member] | Fixed income mutual funds [Member]                                              |          |          |
| **Schedule of Available-for-sale Securities [Line Items]**                                                    |          |          |
| Total, fair value                                                                                             | 1,864         |          |
| Total, Yield                                                                                                  | 5.56%         |          |
| Equity instruments [Member] | Equity mutual funds [Member]                                                    |          |          |
| **Schedule of Available-for-sale Securities [Line Items]**                                                    |          |          |
| Total, fair value                                                                                             | 529           | 484           |
| Total, Yield                                                                                                  | 4.29%         |          |
| Amortized cost                                                                                                | $ 241         | $ 259         |

| X                                                                                                                                                                                                                                                                                                                                                                        |
|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amortized cost of cash and investment securities on deposit with state regulatory authorities in connection with capital requirements.
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| - Definition
Represents yield derived by aggregating the monthly result of interest and dividend income (including the effect of related amortization of premiums and accretion of discounts) divided by amortized cost of available-for-sale securities which are expected to mature after five years and through ten years from the balance sheet date.
+ References
No definition available.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Represents yield derived by aggregating the monthly result of interest and dividend income (including the effect of related amortization of premiums and accretion of discounts) divided by amortized cost of available-for-sale securities which are expected to mature after one year and through five years from the balance sheet date.
+ References
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Represents yield derived by aggregating the monthly result of interest and dividend income (including the effect of related amortization of premiums and accretion of discounts) divided by amortized cost of available-for-sale securities which are expected to mature after ten years from the balance sheet date.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Represents yield derived by aggregating the monthly result of interest and dividend income (including the effect of related amortization of premiums and accretion of discounts) divided by amortized cost of available-for-sale securities which are expected to mature within one year of the balance sheet date.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                     |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Represents yield derived by aggregating the monthly result of interest and dividend income divided by amortized cost of available-for-sale securities.
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No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Carrying amount of cash and investment securities on deposit with state regulatory authorities in connection with capital requirements.
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.
+ References
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of available-for-sale debt securities at fair value maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year.
+ References
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.
+ References
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| - Definition
Amount of available-for-sale debt securities at fair value maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year.
+ References
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| - Definition
Amount of available-for-sale debt securities at cost, net of adjustments, maturing after the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.
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| - Definition
Amount of available-for-sale debt securities at fair value maturing after the tenth fiscal year following the latest fiscal year.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the next fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.
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| - Definition
Amount of available-for-sale debt securities at fair value maturing in the next fiscal year following the latest fiscal year.
+ References
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