| **Investments (Details 5) (USD $)In Millions, unless otherwise specified**                         | Apr. 03, 2015                                                                                                                         | Dec. 31, 2014                                                                                                                         |
|----------------------------------------------------------------------------------------------------|---------------------------------------------------------------------------------------------------------------------------------------|---------------------------------------------------------------------------------------------------------------------------------------|
| **Investments [Abstracts]**                                                                        |                                                                                                                                  |                                                                                                                                  |
| Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis           | $ 1,170us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost                                                     |                                                                                                                                  |
| Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value                     | 1,170us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue                                                           |                                                                                                                                  |
| Available-for-sale Securities, Debt Maturities, after One Through Five Years, Amortized Cost Basis | 1,792us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost                                            |                                                                                                                                  |
| Available-for-sale Securities, Debt Maturities, after One Through Five Years, Fair Value           | 1,837us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue                                                |                                                                                                                                  |
| Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Amortized Cost Basis | 110us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost                                              |                                                                                                                                  |
| Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Fair Value           | 129us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue                                                  |                                                                                                                                  |
| Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis              | 350us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost                                                         |                                                                                                                                  |
| Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value                        | 371us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue                                                             |                                                                                                                                  |
| Available-for-sale Securities, Amortized Cost Basis                                                | 6,848us-gaap_AvailableForSaleSecuritiesAmortizedCost                                                                                  | 6,483us-gaap_AvailableForSaleSecuritiesAmortizedCost                                                                                  |
| **Cost Method Investments [Abstract]**                                                             |                                                                                                                                  |                                                                                                                                  |
| Cost-method Investments, Aggregate Carrying Amount                                                 | 164us-gaap_CostMethodInvestments                                                                                                      | 166us-gaap_CostMethodInvestments                                                                                                      |
| **Held-to-maturity securities, by type**                                                           |                                                                                                                                  |                                                                                                                                  |
| Available-for-sale Securities Fair Value                                                           | 7,986us-gaap_AvailableForSaleSecurities                                                                                               | 7,879us-gaap_AvailableForSaleSecurities                                                                                               |
| Equity Securities [Member]                                                                         |                                                                                                                                  |                                                                                                                                  |
| **Investments [Abstracts]**                                                                        |                                                                                                                                  |                                                                                                                                  |
| Available-for-sale Securities, Amortized Cost Basis                                                | 3,426us-gaap_AvailableForSaleSecuritiesAmortizedCost/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_EquitySecuritiesMember | 2,687us-gaap_AvailableForSaleSecuritiesAmortizedCost/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_EquitySecuritiesMember |
| **Held-to-maturity securities, by type**                                                           |                                                                                                                                  |                                                                                                                                  |
| Available-for-sale Securities Fair Value                                                           | $ 4,479us-gaap_AvailableForSaleSecurities/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_EquitySecuritiesMember            | $ 4,121us-gaap_AvailableForSaleSecurities/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis= us-gaap_EquitySecuritiesMember            |

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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 after adjustments of available-for-sale debt securities at cost, 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 cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Fair value of available-for-sale debt securities maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.
+ References
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| - Definition
Amount after adjustments of available-for-sale debt securities at cost, 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 cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.
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| - Definition
Fair value of available-for-sale debt securities maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount after adjustments of available-for-sale debt securities at cost, 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 cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.
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| - Definition
Fair value of available-for-sale debt securities maturing after the tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount after adjustments of available-for-sale debt securities at cost, 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 cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.
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| - Definition
Fair value of available-for-sale debt securities maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.
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| - Definition
Amount, after adjustment, of cost-method investment. Adjustments include, but are not limited to, dividends received in excess of earnings after date of investment that are considered a return of investment and other than temporary impairments.
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