| **Stock-Based Compensation Schedule of Share Repurchases (Details) - USD ($) shares in Millions, $ in Millions** | 3 Months Ended |        |         |
|------------------------------------------------------------------------------------------------------------------|----------------|--------|---------|
||
| May 2015 Repurchase Program [Member] [Member]                                                                    |           |   |    |   |
| **Equity, Class of Treasury Stock [Line Items]**                                                                 |           |   |    |   |
| Stock Repurchased and Retired During Period, Value                                                               | $ 31           | $ 129  |    |   |
| Stock Repurchase Program, Authorized Amount                                                                      |           |   |    | $ 1,000 |
| Stock Repurchased and Retired During Period, Shares                                                              | 0.3            | 1.9    |    |   |
| May 2017 Repurchase Program [Member]                                                                             |           |   |    |   |
| **Equity, Class of Treasury Stock [Line Items]**                                                                 |           |   |    |   |
| Stock Repurchased and Retired During Period, Value                                                               | $ 119          | $ 0    |    |   |
| Stock Repurchase Program, Authorized Amount                                                                      |           |   | $ 1,200 |   |
| Stock Repurchased and Retired During Period, Shares                                                              | 1.1            | 0.0    |    |   |
| Repurchase Program, Total                                                                                        |           |   |    |   |
| **Equity, Class of Treasury Stock [Line Items]**                                                                 |           |   |    |   |
| Stock Repurchased and Retired During Period, Value                                                               | $ 150          | $ 129  |    |   |
| Stock Repurchased and Retired During Period, Shares                                                              | 1.4            | 1.9    |    |   |

| X                                                                                                                                                                                                                                                                                                                                                                                                                           |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
+ References
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| X                                                                                                                                                                                                                                                                               |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of stock repurchase plan authorized.
+ References
No definition available.
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| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Number of shares that have been repurchased and retired during the period.
+ References
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).
+ References
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| X                                                                                                                                                                  |
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| X                                                                                                                                                            |
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| X                                                                                                                                                          |
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