Derivative Instruments (Maturity Of The Notional Amounts Of Derivative Financial Instruments) (Details) $ in Millions	Jun. 30, 2020 USD ($)
Maturity of the notional amounts of derivative financial instruments
Remaining Life Less Than 1 Year	$ 46,148
Remaining Life - 1 - 5 Years	70,718
Remaining Life - 6 - 10 Years	32,974
Remaining Life - 11 - 30 Years	36,376
Remaining Life Over - 30 Years	7,161
Remaining Life - Total Years	193,377
Interest rate contracts [Member]
Maturity of the notional amounts of derivative financial instruments
Remaining Life Less Than 1 Year	15,008
Remaining Life - 1 - 5 Years	52,698
Remaining Life - 6 - 10 Years	27,065
Remaining Life - 11 - 30 Years	34,785
Remaining Life Over - 30 Years	500
Remaining Life - Total Years	130,056
Foreign currency contracts [Member]
Maturity of the notional amounts of derivative financial instruments
Remaining Life Less Than 1 Year	118
Remaining Life - 1 - 5 Years	386
Remaining Life - 6 - 10 Years	1,002
Remaining Life - 11 - 30 Years	1,579
Remaining Life Over - 30 Years
Remaining Life - Total Years	3,085
Equity market contracts [Member]
Maturity of the notional amounts of derivative financial instruments
Remaining Life Less Than 1 Year	31,022
Remaining Life - 1 - 5 Years	17,575
Remaining Life - 6 - 10 Years	4,907
Remaining Life - 11 - 30 Years	12
Remaining Life Over - 30 Years	6,661
Remaining Life - Total Years	60,177
Credit contracts [Member]
Maturity of the notional amounts of derivative financial instruments
Remaining Life - 1 - 5 Years	59
Remaining Life - Total Years	$ 59