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Financial Instruments (Counterparty credit risk) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Counterparty credit risk  
Total Collateral $ 4,581
Fair value of collateral posted to counterparties for derivative obligations 242
Exposure To Counterparties Including Interest Net Collateral Excluding Derivatives 871
Derivative Liability After Collateral And Outstanding Interest Payments Excluding Embedded Derivatives 1,234
Cash [Member]
 
Counterparty credit risk  
Total Collateral 2,619
Securities Held By Third Parties [Member]
 
Counterparty credit risk  
Securities Held as Collateral, at Fair Value $ 1,962