Fair Value Measurements and Financial Instruments Schedule of assets and liabilities that are measured at fair value on a recurring basis (Details) (USD $)	3 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Sep. 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		Sep. 30, 2014 Recurring [Member] Fair Value [Member] Money market funds [Member]	Dec. 31, 2013 Recurring [Member] Fair Value [Member] Money market funds [Member]	Sep. 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]	Sep. 30, 2014 Recurring [Member] Fair Value [Member] Corporate bonds [Member]	Dec. 31, 2013 Recurring [Member] Fair Value [Member] Corporate bonds [Member]	Sep. 30, 2014 Recurring [Member] Fair Value [Member] Government bonds [Member]	Dec. 31, 2013 Recurring [Member] Fair Value [Member] Government bonds [Member]	Sep. 30, 2014 Recurring [Member] Fair Value [Member] Equity securities [Member]	Dec. 31, 2013 Recurring [Member] Fair Value [Member] Equity securities [Member]	Sep. 30, 2014 Recurring [Member] Fair Value [Member] Interest rate contracts [Member]	Dec. 31, 2013 Recurring [Member] Fair Value [Member] Interest rate contracts [Member]	Sep. 30, 2014 Recurring [Member] Fair Value [Member] Foreign exchange contracts [Member]	Dec. 31, 2013 Recurring [Member] Fair Value [Member] Foreign exchange contracts [Member]	Sep. 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		Sep. 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]	Sep. 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]	Sep. 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]	Sep. 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]	Sep. 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]	Sep. 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		Sep. 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]	Sep. 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]	Sep. 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]	Sep. 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]	Sep. 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]	Sep. 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		Sep. 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]	Sep. 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]	Sep. 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]	Sep. 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]	Sep. 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
Realized gain	$ 6,000,000		$ 6,000,000
Unrealized gain (loss)	0		0
Assets:
Money market funds and highly liquid debt securities				1,649,000,000	[1]	2,079,000,000	[2]	1,647,000,000	2,054,000,000	2,000,000	25,000,000											1,647,000,000	[1]	2,054,000,000	[2]											2,000,000	[1]	25,000,000	[2]											0	[1]	0	[2]
Other investments												1,000,000	2,000,000	7,000,000	7,000,000	11,000,000	13,000,000									0	0	0	0	6,000,000	6,000,000									0	0	7,000,000	7,000,000	5,000,000	7,000,000									1,000,000	2,000,000	0	0	0	0
Derivatives																		0	9,000,000	55,000,000	71,000,000											0	0	0	0											0	9,000,000	55,000,000	71,000,000											0	0	0	0
Liabilities:
Derivatives																				$ 65,000,000	$ 93,000,000													$ 0	$ 0													$ 65,000,000	$ 93,000,000													$ 0	$ 0

[1] Includes $1,647 million of money market funds and $2 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.