Fair Value and Financial Instruments (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified |
3 Months Ended | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Mar. 31, 2013
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Mar. 31, 2013
Fair Value
Money market funds and highly liquid debt securities
Recurring
|
Dec. 31, 2012
Fair Value
Money market funds and highly liquid debt securities
Recurring
|
Mar. 31, 2013
Fair Value
Money market funds
Recurring
|
Dec. 31, 2012
Fair Value
Money market funds
Recurring
|
Mar. 31, 2013
Fair Value
Highly liquid debt securities
Recurring
|
Dec. 31, 2012
Fair Value
Highly liquid debt securities
Recurring
|
Mar. 31, 2013
Fair Value
Corporate bonds
Recurring
|
Dec. 31, 2012
Fair Value
Corporate bonds
Recurring
|
Mar. 31, 2013
Fair Value
Government bonds.
Recurring
|
Dec. 31, 2012
Fair Value
Government bonds.
Recurring
|
Mar. 31, 2013
Fair Value
Equity securities
Recurring
|
Dec. 31, 2012
Fair Value
Equity securities
Recurring
|
Mar. 31, 2013
Fair Value
Interest rate contracts
Recurring
|
Dec. 31, 2012
Fair Value
Interest rate contracts
Recurring
|
Mar. 31, 2013
Fair Value
Foreign exchange contracts
Recurring
|
Dec. 31, 2012
Fair Value
Foreign exchange contracts
Recurring
|
Mar. 31, 2013
Quoted Prices in Active Markets for Identical Assets (Level 1)
Money market funds and highly liquid debt securities
Recurring
|
Dec. 31, 2012
Quoted Prices in Active Markets for Identical Assets (Level 1)
Money market funds and highly liquid debt securities
Recurring
|
Mar. 31, 2013
Quoted Prices in Active Markets for Identical Assets (Level 1)
Corporate bonds
Recurring
|
Dec. 31, 2012
Quoted Prices in Active Markets for Identical Assets (Level 1)
Corporate bonds
Recurring
|
Mar. 31, 2013
Quoted Prices in Active Markets for Identical Assets (Level 1)
Government bonds.
Recurring
|
Dec. 31, 2012
Quoted Prices in Active Markets for Identical Assets (Level 1)
Government bonds.
Recurring
|
Mar. 31, 2013
Quoted Prices in Active Markets for Identical Assets (Level 1)
Equity securities
Recurring
|
Dec. 31, 2012
Quoted Prices in Active Markets for Identical Assets (Level 1)
Equity securities
Recurring
|
Mar. 31, 2013
Quoted Prices in Active Markets for Identical Assets (Level 1)
Interest rate contracts
Recurring
|
Dec. 31, 2012
Quoted Prices in Active Markets for Identical Assets (Level 1)
Interest rate contracts
Recurring
|
Mar. 31, 2013
Quoted Prices in Active Markets for Identical Assets (Level 1)
Foreign exchange contracts
Recurring
|
Dec. 31, 2012
Quoted Prices in Active Markets for Identical Assets (Level 1)
Foreign exchange contracts
Recurring
|
Mar. 31, 2013
Significant Other Observable Inputs (Level 2)
Money market funds and highly liquid debt securities
Recurring
|
Dec. 31, 2012
Significant Other Observable Inputs (Level 2)
Money market funds and highly liquid debt securities
Recurring
|
Mar. 31, 2013
Significant Other Observable Inputs (Level 2)
Corporate bonds
Recurring
|
Dec. 31, 2012
Significant Other Observable Inputs (Level 2)
Corporate bonds
Recurring
|
Mar. 31, 2013
Significant Other Observable Inputs (Level 2)
Government bonds.
Recurring
|
Dec. 31, 2012
Significant Other Observable Inputs (Level 2)
Government bonds.
Recurring
|
Mar. 31, 2013
Significant Other Observable Inputs (Level 2)
Equity securities
Recurring
|
Dec. 31, 2012
Significant Other Observable Inputs (Level 2)
Equity securities
Recurring
|
Mar. 31, 2013
Significant Other Observable Inputs (Level 2)
Interest rate contracts
Recurring
|
Dec. 31, 2012
Significant Other Observable Inputs (Level 2)
Interest rate contracts
Recurring
|
Mar. 31, 2013
Significant Other Observable Inputs (Level 2)
Foreign exchange contracts
Recurring
|
Dec. 31, 2012
Significant Other Observable Inputs (Level 2)
Foreign exchange contracts
Recurring
|
Mar. 31, 2013
Significant Unobservable Inputs (Level 3)
Money market funds and highly liquid debt securities
Recurring
|
Dec. 31, 2012
Significant Unobservable Inputs (Level 3)
Money market funds and highly liquid debt securities
Recurring
|
Mar. 31, 2013
Significant Unobservable Inputs (Level 3)
Corporate bonds
Recurring
|
Dec. 31, 2012
Significant Unobservable Inputs (Level 3)
Corporate bonds
Recurring
|
Mar. 31, 2013
Significant Unobservable Inputs (Level 3)
Government bonds.
Recurring
|
Dec. 31, 2012
Significant Unobservable Inputs (Level 3)
Government bonds.
Recurring
|
Mar. 31, 2013
Significant Unobservable Inputs (Level 3)
Equity securities
Recurring
|
Dec. 31, 2012
Significant Unobservable Inputs (Level 3)
Equity securities
Recurring
|
Mar. 31, 2013
Significant Unobservable Inputs (Level 3)
Interest rate contracts
Recurring
|
Dec. 31, 2012
Significant Unobservable Inputs (Level 3)
Interest rate contracts
Recurring
|
Mar. 31, 2013
Significant Unobservable Inputs (Level 3)
Foreign exchange contracts
Recurring
|
Dec. 31, 2012
Significant Unobservable Inputs (Level 3)
Foreign exchange contracts
Recurring
|
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Fair Value Disclosures [Abstract] | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Net assets value (in dollar per share) | $ 1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Assets: | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Money market funds and highly liquid debt securities | $ 2,118 | [1] | $ 2,133 | [2] | $ 2,093 | $ 2,108 | $ 25 | $ 25 | $ 2,093 | [1] | $ 2,108 | [2] | $ 25 | [1] | $ 25 | [2] | $ 0 | [1] | $ 0 | [2] | |||||||||||||||||||||||||||||||||||||||||||||
Other investments | 12 | 12 | 7 | 8 | 4 | 5 | 0 | 0 | 0 | 0 | 4 | 5 | 0 | 0 | 7 | 8 | 0 | 0 | 12 | 12 | 0 | 0 | 0 | 0 | |||||||||||||||||||||||||||||||||||||||||
Derivatives | 16 | 17 | 52 | 193 | 0 | 0 | 0 | 0 | 16 | 17 | 52 | 193 | 0 | 0 | 0 | 0 | |||||||||||||||||||||||||||||||||||||||||||||||||
Liabilities: | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Derivatives | $ 132 | $ 251 | $ 0 | $ 0 | $ 132 | $ 251 | $ 0 | $ 0 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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