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Debt 2 (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Maturities of outstanding debt  
Amount due in 2016 $ 10us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
Amount due in 2017 5us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
Amount due in 2018 1us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
Amount due in 2019 250us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
Amount due in 2020 748us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive
Amount due thereafter $ 249us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive