Fair Value and Financial Instruments (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2013 Fair Value [Member] Money market funds and highly liquid debt securities Recurring [Member]		Dec. 31, 2012 Fair Value [Member] Money market funds and highly liquid debt securities Recurring [Member]		Jun. 30, 2013 Fair Value [Member] Money market funds [Member] Recurring [Member]	Dec. 31, 2012 Fair Value [Member] Money market funds [Member] Recurring [Member]	Jun. 30, 2013 Fair Value [Member] Highly liquid debt securities [Member] Recurring [Member]	Dec. 31, 2012 Fair Value [Member] Highly liquid debt securities [Member] Recurring [Member]	Jun. 30, 2013 Fair Value [Member] Corporate bonds [Member] Recurring [Member]	Dec. 31, 2012 Fair Value [Member] Corporate bonds [Member] Recurring [Member]	Jun. 30, 2013 Fair Value [Member] Government bonds [Member] Recurring [Member]	Dec. 31, 2012 Fair Value [Member] Government bonds [Member] Recurring [Member]	Jun. 30, 2013 Fair Value [Member] Equity securities [Member] Recurring [Member]	Dec. 31, 2012 Fair Value [Member] Equity securities [Member] Recurring [Member]	Jun. 30, 2013 Fair Value [Member] Interest rate contracts [Member] Recurring [Member]	Dec. 31, 2012 Fair Value [Member] Interest rate contracts [Member] Recurring [Member]	Jun. 30, 2013 Fair Value [Member] Foreign exchange contracts [Member] Recurring [Member]	Dec. 31, 2012 Fair Value [Member] Foreign exchange contracts [Member] Recurring [Member]	Jun. 30, 2013 Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Money market funds and highly liquid debt securities Recurring [Member]		Dec. 31, 2012 Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Money market funds and highly liquid debt securities Recurring [Member]		Jun. 30, 2013 Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Corporate bonds [Member] Recurring [Member]	Dec. 31, 2012 Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Corporate bonds [Member] Recurring [Member]	Jun. 30, 2013 Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Government bonds [Member] Recurring [Member]	Dec. 31, 2012 Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Government bonds [Member] Recurring [Member]	Jun. 30, 2013 Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Equity securities [Member] Recurring [Member]	Dec. 31, 2012 Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Equity securities [Member] Recurring [Member]	Jun. 30, 2013 Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Interest rate contracts [Member] Recurring [Member]	Dec. 31, 2012 Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Interest rate contracts [Member] Recurring [Member]	Jun. 30, 2013 Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Foreign exchange contracts [Member] Recurring [Member]	Dec. 31, 2012 Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Foreign exchange contracts [Member] Recurring [Member]	Jun. 30, 2013 Significant Other Observable Inputs (Level 2) [Member] Money market funds and highly liquid debt securities Recurring [Member]		Dec. 31, 2012 Significant Other Observable Inputs (Level 2) [Member] Money market funds and highly liquid debt securities Recurring [Member]		Jun. 30, 2013 Significant Other Observable Inputs (Level 2) [Member] Corporate bonds [Member] Recurring [Member]	Dec. 31, 2012 Significant Other Observable Inputs (Level 2) [Member] Corporate bonds [Member] Recurring [Member]	Jun. 30, 2013 Significant Other Observable Inputs (Level 2) [Member] Government bonds [Member] Recurring [Member]	Dec. 31, 2012 Significant Other Observable Inputs (Level 2) [Member] Government bonds [Member] Recurring [Member]	Jun. 30, 2013 Significant Other Observable Inputs (Level 2) [Member] Equity securities [Member] Recurring [Member]	Dec. 31, 2012 Significant Other Observable Inputs (Level 2) [Member] Equity securities [Member] Recurring [Member]	Jun. 30, 2013 Significant Other Observable Inputs (Level 2) [Member] Interest rate contracts [Member] Recurring [Member]	Dec. 31, 2012 Significant Other Observable Inputs (Level 2) [Member] Interest rate contracts [Member] Recurring [Member]	Jun. 30, 2013 Significant Other Observable Inputs (Level 2) [Member] Foreign exchange contracts [Member] Recurring [Member]	Dec. 31, 2012 Significant Other Observable Inputs (Level 2) [Member] Foreign exchange contracts [Member] Recurring [Member]	Jun. 30, 2013 Significant Unobservable Inputs (Level 3) [Member] Money market funds and highly liquid debt securities Recurring [Member]		Dec. 31, 2012 Significant Unobservable Inputs (Level 3) [Member] Money market funds and highly liquid debt securities Recurring [Member]		Jun. 30, 2013 Significant Unobservable Inputs (Level 3) [Member] Corporate bonds [Member] Recurring [Member]	Dec. 31, 2012 Significant Unobservable Inputs (Level 3) [Member] Corporate bonds [Member] Recurring [Member]	Jun. 30, 2013 Significant Unobservable Inputs (Level 3) [Member] Government bonds [Member] Recurring [Member]	Dec. 31, 2012 Significant Unobservable Inputs (Level 3) [Member] Government bonds [Member] Recurring [Member]	Jun. 30, 2013 Significant Unobservable Inputs (Level 3) [Member] Equity securities [Member] Recurring [Member]	Dec. 31, 2012 Significant Unobservable Inputs (Level 3) [Member] Equity securities [Member] Recurring [Member]	Jun. 30, 2013 Significant Unobservable Inputs (Level 3) [Member] Interest rate contracts [Member] Recurring [Member]	Dec. 31, 2012 Significant Unobservable Inputs (Level 3) [Member] Interest rate contracts [Member] Recurring [Member]	Jun. 30, 2013 Significant Unobservable Inputs (Level 3) [Member] Foreign exchange contracts [Member] Recurring [Member]	Dec. 31, 2012 Significant Unobservable Inputs (Level 3) [Member] Foreign exchange contracts [Member] Recurring [Member]
Fair Value Disclosures [Abstract]
Net assets value (in dollar per share)	$ 1
Assets:
Money market funds and highly liquid debt securities		$ 2,438	[1]	$ 2,133	[2]	$ 2,413	$ 2,108	$ 25	$ 25											$ 2,413	[1]	$ 2,108	[2]											$ 25	[1]	$ 25	[2]											$ 0	[1]	$ 0	[2]
Other investments										18	12	7	8	28	5									0	0	0	0	28	5									0	0	7	8	0	0									18	12	0	0	0	0
Derivatives																16	17	40	193											0	0	0	0											16	17	40	193											0	0	0	0
Liabilities:
Derivatives																		$ 111	$ 251													$ 0	$ 0													$ 111	$ 251													$ 0	$ 0

[1] Includes $2,413 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 $2,108 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.