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Equity (Schedule of redeemable noncontrolling interest) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Increase (Decrease) in Temporary Equity [Roll Forward]  
Balance as of December 31, 2014 $ 810us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount
Net income attributable to noncontrolling interest 25us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest
Distributions payable to noncontrolling interest (17)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
Redemption value adjustment (8)us-gaap_MinorityInterestChangeInRedemptionValue
Balance as of March 31, 2015 $ 810us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount