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Financial Instruments (Counterparty credit risk) (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Counterparty credit risk  
Total Collateral $ 6,723
Fair value of collateral posted to counterparties for derivative obligations 283
Exposure To Counterparties Including Interest Net Collateral Excluding Derivatives 329
Derivative Liability After Collateral And Outstanding Interest Payments Excluding Embedded Derivatives 334
Cash [Member]
 
Counterparty credit risk  
Total Collateral 3,600
Securities Held By Third Parties [Member]
 
Counterparty credit risk  
Securities Held as Collateral, at Fair Value $ 3,123