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Basis of Presentation, Uses of Estimates and Significant Accounting Policies Redeemable Noncontrolling Interests (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Noncontrolling Interest [Line Items]      
Redeemable noncontrolling interest, beginning of period $ 1,175us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount $ 2,121us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount  
Net earnings 0us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest 48us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest  
Acquisitions 203us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination 360us-gaap_NoncontrollingInterestIncreaseFromBusinessCombination  
Redemptions 0us-gaap_MinorityInterestDecreaseFromRedemptions (1,417)us-gaap_MinorityInterestDecreaseFromRedemptions (11)us-gaap_MinorityInterestDecreaseFromRedemptions
Distributions (40)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders 0us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders  
Fair value and other adjustments 50us-gaap_MinorityInterestChangeInRedemptionValue 63us-gaap_MinorityInterestChangeInRedemptionValue  
Redeemable Noncontrolling Interest, end of period $ 1,388us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount $ 1,175us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount $ 2,121us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount