| **Fair Value Measurements (Details) (USD $)In Millions, unless otherwise specified** | Sep. 28, 2012 | Dec. 31, 2011 |
|--------------------------------------------------------------------------------------|---------------|---------------|
| **Assets and liabilities measured at fair value on a recurring basis**               |          |          |
| Available-for-sale securities                                                        | $ 5,004       | $ 1,401       |
| Level 1                                                                              |          |          |
| **Assets and liabilities measured at fair value on a recurring basis**               |          |          |
| Trading Securities                                                                   | 142           | 166           |
| Available-for-sale securities                                                        | 1,713         | 1,071         |
| Derivatives, assets                                                                  | 52            | 39            |
| Total assets                                                                         | 1,907         | 1,276         |
| Derivatives, liabilities                                                             | 18            | 5             |
| Total liabilities                                                                    | 18            | 5             |
| Level 2                                                                              |          |          |
| **Assets and liabilities measured at fair value on a recurring basis**               |          |          |
| Trading Securities                                                                   | 109           | 41            |
| Available-for-sale securities                                                        | 3,150         | 214           |
| Derivatives, assets                                                                  | 516           | 467           |
| Total assets                                                                         | 3,775         | 722           |
| Derivatives, liabilities                                                             | 158           | 201           |
| Total liabilities                                                                    | 158           | 201           |
| Level 3                                                                              |          |          |
| **Assets and liabilities measured at fair value on a recurring basis**               |          |          |
| Trading Securities                                                                   | 4             | 4             |
| Available-for-sale securities                                                        | 141           | 116           |
| Derivatives, assets                                                                  | 0             | 0             |
| Total assets                                                                         | 145           | 120           |
| Derivatives, liabilities                                                             | 0             | 0             |
| Total liabilities                                                                    | 0             | 0             |
| Netting Adjustment                                                                   |          |          |
| **Assets and liabilities measured at fair value on a recurring basis**               |          |          |
| Trading Securities                                                                   | 0             | 0             |
| Available-for-sale securities                                                        | 0             | 0             |
| Derivatives, assets                                                                  | (105)         | (117)         |
| Total assets                                                                         | (105)         | (117)         |
| Derivatives, liabilities                                                             | (115)         | (121)         |
| Total liabilities                                                                    | (115)         | (121)         |
| Fair Value Measurements                                                              |          |          |
| **Assets and liabilities measured at fair value on a recurring basis**               |          |          |
| Trading Securities                                                                   | 255           | 211           |
| Available-for-sale securities                                                        | 5,004         | 1,401         |
| Derivatives, assets                                                                  | 463           | 389           |
| Total assets                                                                         | 5,722         | 2,001         |
| Derivatives, liabilities                                                             | 61            | 85            |
| Total liabilities                                                                    | $ 61          | $ 85          |

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| - Definition
This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Fair values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Derivative instrument obligations meeting the definition of a liability which the Company is a party to as of the balance sheet date.
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
This element represents the aggregate of the liabilities reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The total of financial instruments that are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time) or for debt and equity securities formerly categorized as available-for-sale or held-to-maturity which the entity held as of the date it opted to account for such securities at fair value. An enterprise may also categorize such a security as trading without the intent to sell it in the near term assuming the decision to categorize the security as trading occurred at acquisition.
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