Derivative Instruments (Maturity Of The Notional Amounts Of Derivative Financial Instruments) (Details) $ in Millions	6 Months Ended
	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	70,972
Remaining Life - 6 - 10 Years	32,974
Remaining Life - 11 - 30 Years	37,007
Remaining Life Over - 30 Years	8,374
Remaining Life - Total Years	195,475
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	35,416
Remaining Life Over - 30 Years	1,713
Remaining Life - Total Years	$ 131,900
Derivative maturity date	Apr. 20, 2067
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 - Total Years	$ 3,085
Derivative maturity date	Jun. 17, 2050
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	17,829
Remaining Life - 6 - 10 Years	4,907
Remaining Life - 11 - 30 Years	12
Remaining Life Over - 30 Years	6,661
Remaining Life - Total Years	60,431
Credit contracts [Member]
Maturity of the notional amounts of derivative financial instruments
Remaining Life - 1 - 5 Years	59
Remaining Life - Total Years	$ 59