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Derivative Instruments and Hedging Activities (Offsetting Derivative Instruments and Credit Risk-Related Features) (Details) - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Assets    
Gross $ 840 $ 693
Eligible for Offset, Derivative Instruments 523 437
Eligible for Offset, Cash Collateral Received 88 74
Net 229 182
Liabilities    
Gross 619 539
Eligible for Offset, Derivative Instruments 523 437
Eligible for Offset, Cash Collateral Pledged 21 30
Net 75 $ 72
Derivative, Credit Risk Related Contingent Features [Abstract]    
Aggregate fair value of derivative instruments in a net liability position 74  
Aggregate fair value of collateral posted on these derivative instruments 78  
Aggregate fair value of additional collateral requirements, primarily related to further adequate assurance features $ 12