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Financial Instruments (Counterparty credit risk) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Counterparty credit risk  
Total Collateral $ 8,099
Fair value of collateral posted to counterparties for derivataive obligations 212
Exposure To Counterparties Including Interest Net Collateral Excluding Derivatives 862
Derivative Liability After Collateral And Outstanding Interest Payments Excluding Embedded Derivatives 265
Cash [Member]
 
Counterparty credit risk  
Total Collateral 3,728
Securities Held By Third Parties [Member]
 
Counterparty credit risk  
Securities Held as Collateral, at Fair Value $ 4,371