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Fair Value Measurements and Financial Instruments Schedule of assets and liabilities that are measured at fair value on a recurring basis (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 6 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Jun. 30, 2014 | Jun. 30, 2014 Recurring [Member] Fair Value [Member] Money market funds and highly liquid debt securities | Dec. 31, 2013 Recurring [Member] Fair Value [Member] Money market funds and highly liquid debt securities | Jun. 30, 2014 Recurring [Member] Fair Value [Member] Money market funds [Member] | Dec. 31, 2013 Recurring [Member] Fair Value [Member] Money market funds [Member] | Jun. 30, 2014 Recurring [Member] Fair Value [Member] Highly liquid debt securities [Member] | Dec. 31, 2013 Recurring [Member] Fair Value [Member] Highly liquid debt securities [Member] | Jun. 30, 2014 Recurring [Member] Fair Value [Member] Corporate bonds [Member] | Dec. 31, 2013 Recurring [Member] Fair Value [Member] Corporate bonds [Member] | Jun. 30, 2014 Recurring [Member] Fair Value [Member] Government bonds [Member] | Dec. 31, 2013 Recurring [Member] Fair Value [Member] Government bonds [Member] | Jun. 30, 2014 Recurring [Member] Fair Value [Member] Equity securities [Member] | Dec. 31, 2013 Recurring [Member] Fair Value [Member] Equity securities [Member] | Jun. 30, 2014 Recurring [Member] Fair Value [Member] Interest rate contracts [Member] | Dec. 31, 2013 Recurring [Member] Fair Value [Member] Interest rate contracts [Member] | Jun. 30, 2014 Recurring [Member] Fair Value [Member] Foreign exchange contracts [Member] | Dec. 31, 2013 Recurring [Member] Fair Value [Member] Foreign exchange contracts [Member] | Jun. 30, 2014 Recurring [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Money market funds and highly liquid debt securities | Dec. 31, 2013 Recurring [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Money market funds and highly liquid debt securities | Jun. 30, 2014 Recurring [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Corporate bonds [Member] | Dec. 31, 2013 Recurring [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Corporate bonds [Member] | Jun. 30, 2014 Recurring [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Government bonds [Member] | Dec. 31, 2013 Recurring [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Government bonds [Member] | Jun. 30, 2014 Recurring [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Equity securities [Member] | Dec. 31, 2013 Recurring [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Equity securities [Member] | Jun. 30, 2014 Recurring [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Interest rate contracts [Member] | Dec. 31, 2013 Recurring [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Interest rate contracts [Member] | Jun. 30, 2014 Recurring [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Foreign exchange contracts [Member] | Dec. 31, 2013 Recurring [Member] Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Foreign exchange contracts [Member] | Jun. 30, 2014 Recurring [Member] Significant Other Observable Inputs (Level 2) [Member] Money market funds and highly liquid debt securities | Dec. 31, 2013 Recurring [Member] Significant Other Observable Inputs (Level 2) [Member] Money market funds and highly liquid debt securities | Jun. 30, 2014 Recurring [Member] Significant Other Observable Inputs (Level 2) [Member] Corporate bonds [Member] | Dec. 31, 2013 Recurring [Member] Significant Other Observable Inputs (Level 2) [Member] Corporate bonds [Member] | Jun. 30, 2014 Recurring [Member] Significant Other Observable Inputs (Level 2) [Member] Government bonds [Member] | Dec. 31, 2013 Recurring [Member] Significant Other Observable Inputs (Level 2) [Member] Government bonds [Member] | Jun. 30, 2014 Recurring [Member] Significant Other Observable Inputs (Level 2) [Member] Equity securities [Member] | Dec. 31, 2013 Recurring [Member] Significant Other Observable Inputs (Level 2) [Member] Equity securities [Member] | Jun. 30, 2014 Recurring [Member] Significant Other Observable Inputs (Level 2) [Member] Interest rate contracts [Member] | Dec. 31, 2013 Recurring [Member] Significant Other Observable Inputs (Level 2) [Member] Interest rate contracts [Member] | Jun. 30, 2014 Recurring [Member] Significant Other Observable Inputs (Level 2) [Member] Foreign exchange contracts [Member] | Dec. 31, 2013 Recurring [Member] Significant Other Observable Inputs (Level 2) [Member] Foreign exchange contracts [Member] | Jun. 30, 2014 Recurring [Member] Significant Unobservable Inputs (Level 3) [Member] Money market funds and highly liquid debt securities | Dec. 31, 2013 Recurring [Member] Significant Unobservable Inputs (Level 3) [Member] Money market funds and highly liquid debt securities | Jun. 30, 2014 Recurring [Member] Significant Unobservable Inputs (Level 3) [Member] Corporate bonds [Member] | Dec. 31, 2013 Recurring [Member] Significant Unobservable Inputs (Level 3) [Member] Corporate bonds [Member] | Jun. 30, 2014 Recurring [Member] Significant Unobservable Inputs (Level 3) [Member] Government bonds [Member] | Dec. 31, 2013 Recurring [Member] Significant Unobservable Inputs (Level 3) [Member] Government bonds [Member] | Jun. 30, 2014 Recurring [Member] Significant Unobservable Inputs (Level 3) [Member] Equity securities [Member] | Dec. 31, 2013 Recurring [Member] Significant Unobservable Inputs (Level 3) [Member] Equity securities [Member] | Jun. 30, 2014 Recurring [Member] Significant Unobservable Inputs (Level 3) [Member] Interest rate contracts [Member] | Dec. 31, 2013 Recurring [Member] Significant Unobservable Inputs (Level 3) [Member] Interest rate contracts [Member] | Jun. 30, 2014 Recurring [Member] Significant Unobservable Inputs (Level 3) [Member] Foreign exchange contracts [Member] | Dec. 31, 2013 Recurring [Member] Significant Unobservable Inputs (Level 3) [Member] Foreign exchange contracts [Member]
Fair Value Disclosures [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net assets value (in dollar per share) | $ 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds and highly liquid debt securities |  | $ 2,129 | [1] | $ 2,079 | [2] | $ 2,104 | $ 2,054 | $ 25 | $ 25 |  |  |  |  |  |  |  |  |  |  | $ 2,104 | [1] | $ 2,054 | [2] |  |  |  |  |  |  |  |  |  |  | $ 25 | [1] | $ 25 | [2] |  |  |  |  |  |  |  |  |  |  | $ 0 | [1] | $ 0 | [2] |  |  |  |  |  |  |  |  |  |
Other investments |  |  |  |  |  |  |  |  |  | 1 | 2 | 7 | 7 | 11 | 13 |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 0 | 6 | 6 |  |  |  |  |  |  |  |  | 0 | 0 | 7 | 7 | 5 | 7 |  |  |  |  |  |  |  |  | 1 | 2 | 0 | 0 | 0 | 0 |  |  |  |
Derivatives |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9 | 9 | 82 | 71 |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 0 |  |  |  |  |  |  |  |  |  |  | 9 | 9 | 82 | 71 |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0 | 0
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 90 | $ 93 |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  | $ 90 | $ 93 |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0
[1] | Includes $2,104 million of money market funds and $25 million of highly liquid debt securities that are classified as Fiduciary assets, Short-term investments or Cash and cash equivalents in the Condensed Consolidated Statements of Financial Position, depending on their nature and initial maturity. See Note 8 "Investments" for additional information regarding the Company’s investments.
[2] | Includes $2,054 million of money market funds and $25 million of highly liquid debt securities that are classified as Fiduciary assets, Short-term investments or Cash and cash equivalents in the Condensed Consolidated Statements of Financial Position, depending on their nature and initial maturity. See Note 8 "Investments" for additional information regarding the Company’s investments.

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