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	3 Months Ended
	Mar. 31, 2014	Mar. 31, 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		Mar. 31, 2014 Recurring [Member] Fair Value [Member] Money market funds [Member]	Dec. 31, 2013 Recurring [Member] Fair Value [Member] Money market funds [Member]	Mar. 31, 2014 Recurring [Member] Fair Value [Member] Highly liquid debt securities [Member]	Dec. 31, 2013 Recurring [Member] Fair Value [Member] Highly liquid debt securities [Member]	Mar. 31, 2014 Recurring [Member] Fair Value [Member] Corporate bonds [Member]	Dec. 31, 2013 Recurring [Member] Fair Value [Member] Corporate bonds [Member]	Mar. 31, 2014 Recurring [Member] Fair Value [Member] Government bonds [Member]	Dec. 31, 2013 Recurring [Member] Fair Value [Member] Government bonds [Member]	Mar. 31, 2014 Recurring [Member] Fair Value [Member] Equity securities [Member]	Dec. 31, 2013 Recurring [Member] Fair Value [Member] Equity securities [Member]	Mar. 31, 2014 Recurring [Member] Fair Value [Member] Interest rate contracts [Member]	Dec. 31, 2013 Recurring [Member] Fair Value [Member] Interest rate contracts [Member]	Mar. 31, 2014 Recurring [Member] Fair Value [Member] Foreign exchange contracts [Member]	Dec. 31, 2013 Recurring [Member] Fair Value [Member] Foreign exchange contracts [Member]	Mar. 31, 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		Mar. 31, 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]	Mar. 31, 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]	Mar. 31, 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]	Mar. 31, 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]	Mar. 31, 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]	Mar. 31, 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		Mar. 31, 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]	Mar. 31, 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]	Mar. 31, 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]	Mar. 31, 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]	Mar. 31, 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]	Mar. 31, 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		Mar. 31, 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]	Mar. 31, 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]	Mar. 31, 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]	Mar. 31, 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]	Mar. 31, 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		$ 2,086	[1]	$ 2,079	[2]	$ 2,061	$ 2,054	$ 25	$ 25											$ 2,061	[1]	$ 2,054	[2]											$ 25	[1]	$ 25	[2]											$ 0	[1]	$ 0	[2]
Other investments										1	2	7	7	15	13									0	0	0	0	6	6									0	0	7	7	9	7									1	2	0	0	0	0
Derivatives																9	9	73	71											0	0	0	0											9	9	73	71											0	0	0	0
Liabilities:
Derivatives																		$ 94	$ 93													$ 0	$ 0													$ 94	$ 93													$ 0	$ 0

[1] Includes $2,061 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.