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Derivative Instruments (Maturity Of The Notional Amounts Of Derivative Financial Instruments) (Details)
$ in Millions
 9 Months Ended
Sep. 30, 2017
USD ($)
Maturity of the notional amounts of derivative financial instruments  
Remaining Life Less Than 1 Year $ 26,589
Remaining Life - 1 - 5 Years 31,017
Remaining Life - 6 - 10 Years 32,148
Remaining Life - 11 - 30 Years 16,441
Remaining Life Over - 30 Years 2,660
Remaining Life - Total Years 108,855
Interest rate contracts [Member]  
Maturity of the notional amounts of derivative financial instruments  
Remaining Life Less Than 1 Year 8,901 [1]
Remaining Life - 1 - 5 Years 20,768 [1]
Remaining Life - 6 - 10 Years 30,938 [1]
Remaining Life - 11 - 30 Years 15,472 [1]
Remaining Life Over - 30 Years 1,213 [1]
Remaining Life - Total Years $ 77,292 [1]
Derivative maturity date Apr. 01, 2067
Foreign currency contracts [Member]  
Maturity of the notional amounts of derivative financial instruments  
Remaining Life Less Than 1 Year $ 36 [2]
Remaining Life - 1 - 5 Years 212 [2]
Remaining Life - 6 - 10 Years 391 [2]
Remaining Life - 11 - 30 Years 954 [2]
Remaining Life Over - 30 Years 11 [2]
Remaining Life - Total Years $ 1,604 [2]
Derivative maturity date Sep. 01, 2049
Equity market contracts [Member]  
Maturity of the notional amounts of derivative financial instruments  
Remaining Life Less Than 1 Year $ 17,652
Remaining Life - 1 - 5 Years 10,037
Remaining Life - 6 - 10 Years 819
Remaining Life - 11 - 30 Years 15
Remaining Life Over - 30 Years 1,436
Remaining Life - Total Years 29,959
Credit contracts [Member]  
Maturity of the notional amounts of derivative financial instruments  
Remaining Life Less Than 1 Year
Remaining Life - 1 - 5 Years
Remaining Life - 6 - 10 Years
Remaining Life - 11 - 30 Years
Remaining Life Over - 30 Years
Remaining Life - Total Years
[1] As of September 30, 2017, the latest maturity date for which we were hedging our exposure to the variability in future cash flows for these instruments was April 2067.
[2] As of September 30, 2017, the latest maturity date for which we were hedging our exposure to the variability in future cash flows for these instruments was September 2049.