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	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2013 Fair Value [Member] Money market funds and highly liquid debt securities [Member] Recurring [Member]		Dec. 31, 2012 Fair Value [Member] Money market funds and highly liquid debt securities [Member] Recurring [Member]		Dec. 31, 2013 Fair Value [Member] Corporate bonds [Member] Recurring [Member]	Dec. 31, 2012 Fair Value [Member] Corporate bonds [Member] Recurring [Member]	Dec. 31, 2013 Fair Value [Member] Government bonds [Member] Recurring [Member]	Dec. 31, 2012 Fair Value [Member] Government bonds [Member] Recurring [Member]	Dec. 31, 2013 Fair Value [Member] Equity securities [Member] Recurring [Member]	Dec. 31, 2012 Fair Value [Member] Equity securities [Member] Recurring [Member]	Dec. 31, 2013 Fair Value [Member] Interest rate contracts [Member] Recurring [Member]	Dec. 31, 2012 Fair Value [Member] Interest rate contracts [Member] Recurring [Member]	Dec. 31, 2013 Fair Value [Member] Foreign exchange contracts [Member] Recurring [Member]	Dec. 31, 2012 Fair Value [Member] Foreign exchange contracts [Member] Recurring [Member]	Dec. 31, 2013 Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Money market funds and highly liquid debt securities [Member] Recurring [Member]		Dec. 31, 2012 Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] Money market funds and highly liquid debt securities [Member] Recurring [Member]		Dec. 31, 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]	Dec. 31, 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]	Dec. 31, 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]	Dec. 31, 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]	Dec. 31, 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]	Dec. 31, 2013 Significant Other Observable Inputs (Level 2) [Member] Money market funds and highly liquid debt securities [Member] Recurring [Member]		Dec. 31, 2012 Significant Other Observable Inputs (Level 2) [Member] Money market funds and highly liquid debt securities [Member] Recurring [Member]		Dec. 31, 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]	Dec. 31, 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]	Dec. 31, 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]	Dec. 31, 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]	Dec. 31, 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]	Dec. 31, 2013 Significant Unobservable Inputs (Level 3) [Member] Money market funds and highly liquid debt securities [Member] Recurring [Member]		Dec. 31, 2012 Significant Unobservable Inputs (Level 3) [Member] Money market funds and highly liquid debt securities [Member] Recurring [Member]		Dec. 31, 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]	Dec. 31, 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]	Dec. 31, 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]	Dec. 31, 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]	Dec. 31, 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		$ 2,079	[1]	$ 2,133	[2]											$ 2,054	[1]	$ 2,108	[2]											$ 25	[1]	$ 25	[2]											$ 0	[1]	$ 0	[2]
Other investments						2	12	7	8	13	5									0	0	0	0	6	5									0	0	7	8	7	0									2	12	0	0	0	0
Derivatives												9	17	71	193											0	0	0	0											9	17	71	193											0	0	0	0
Liabilities:
Derivatives														$ 93	$ 251													$ 0	$ 0													$ 93	$ 251													$ 0	$ 0

[1] 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 equivalents in the Consolidated Statements of Financial Position, depending on their nature and initial maturity. See Note 7 "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 equivalents in the Consolidated Statements of Financial Position, depending on their nature and initial maturity. See Note 7 "Investments" for additional information regarding the Company's investments.