Debt (Details)	0 Months Ended	6 Months Ended					3 Months Ended	6 Months Ended							0 Months Ended
	Jun. 30, 2014 EUR (€)	Jun. 30, 2014 USD ($)		Jun. 30, 2013 USD ($)	Dec. 31, 2013 USD ($)		Jun. 30, 2014 Commercial paper [Member] USD ($)	Jun. 30, 2014 Commercial paper [Member] USD ($)	Dec. 31, 2013 Commercial paper [Member] USD ($)	Jun. 30, 2014 Debt Securities 6.25 Percent, Due 2014 [Member] Notes Payable, Other Payables [Member] USD ($)	Jun. 30, 2014 Debt Securities 6.25 Percent, Due 2014 [Member] Notes Payable, Other Payables [Member] EUR (€)	May 20, 2014 3.50% notes due 2024 [Member] Notes Payable, Other Payables [Member] USD ($)	May 20, 2014 4.60% notes due 2044 [Member] Notes Payable, Other Payables [Member] USD ($)	May 07, 2014 2.875% notes due 2026 [Member] Notes Payable, Other Payables [Member] EUR (€)	Jul. 01, 2014 Subsequent Event [Member] Debt Securities 6.25 Percent, Due 2014 [Member] USD ($)	Jul. 01, 2014 Subsequent Event [Member] Debt Securities 6.25 Percent, Due 2014 [Member] EUR (€)	Jul. 01, 2014 Subsequent Event [Member] Debt Securities 6.25 Percent, Due 2014 [Member]	Jun. 30, 2014 Short-term debt and current portion of long-term debt [Member] Debt Securities 6.25 Percent, Due 2014 [Member] Notes Payable, Other Payables [Member] USD ($)	Jun. 30, 2014 Accounts Payable and Accrued Liabilities [Member] USD ($)	Jun. 30, 2014 Other Current Assets [Member] USD ($)
Debt Instrument [Line Items]
Total debt							$ 107,000,000	$ 107,000,000	$ 0
Weighted average commercial paper outstanding							447,000,000	326,000,000
Weighted-average interest rates (as a percent)							0.38%	0.36%
Deposit with trustee	531,000,000	681,000,000		0
Assets Held in Trust, Current		723,000,000	[1]		0	[1]														723,000,000
Interest Payable, Current										42,000,000									42,000,000
Debt Instrument, Face Amount										681,000,000	500,000,000	250,000,000	550,000,000	500,000,000				681,000,000
Repayments of Debt															531,000,000
Debt Instrument, Interest Rate, Stated Percentage										6.25%	6.25%	3.50%	4.60%	2.875%			6.25%
Extinguishment of Debt, Amount																€ 500,000,000

[1] (1)Deposit with trustee relates to the 6.25% €500 million debt securities due July 2014 and the related accrued interest, which is described further in Note 9 "Debt." The principal amount included in this balance is $681 million and the accrued interest amount is $42 million.