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Financial Instruments (Counterparty credit risk) (Details)
$ in Millions
Sep. 30, 2015
USD ($)
Counterparty credit risk  
Exposure To Counter Parties $ 895
Total Collateral 4,552
Exposure To Counterparties Including Interest Net Collateral Excluding Derivatives 1,148
Derivative Liability After Collateral And Outstanding Interest Payments Excluding Embedded Derivatives 540
Cash [Member]  
Counterparty credit risk  
Total Collateral 2,858
Securities Held By Third Parties [Member]  
Counterparty credit risk  
Securities Held as Collateral, at Fair Value $ 1,694