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Debt, Net Payments and Proceeds on Other Debt (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Debt Disclosure [Abstract]    
Net proceeds on short-term debt $ 204us-gaap_ProceedsFromRepaymentsOfShortTermDebt $ 1us-gaap_ProceedsFromRepaymentsOfShortTermDebt
Proceeds from issuance of long-term debt 663us-gaap_ProceedsFromIssuanceOfLongTermDebt 18us-gaap_ProceedsFromIssuanceOfLongTermDebt
Payments on long-term debt(1) (1,017)us-gaap_RepaymentsOfLongTermDebt [1] (15)us-gaap_RepaymentsOfLongTermDebt [1]
Net (payments) proceeds on debt $ (150)us-gaap_ProceedsFromRepaymentsOfDebt $ 4us-gaap_ProceedsFromRepaymentsOfDebt
[1] Includes current maturities.