Derivative Instruments (Maturity Of The Notional Amounts Of Derivative Financial Instruments) (Details) $ in Millions	Jun. 30, 2021 USD ($)
Maturity of the notional amounts of derivative financial instruments
Remaining Life Less Than 1 Year	$ 55,597
Remaining Life - 1 - 5 Years	64,583
Remaining Life - 6 - 10 Years	23,890
Remaining Life - 11 - 30 Years	13,653
Remaining Life - Over 30 Years	8,713
Remaining Life - Total Years	166,436
Interest Rate Contracts [Member]
Maturity of the notional amounts of derivative financial instruments
Remaining Life Less Than 1 Year	2,426
Remaining Life - 1 - 5 Years	48,393
Remaining Life - 6 - 10 Years	15,248
Remaining Life - 11 - 30 Years	11,791
Remaining Life - Total Years	77,858
Foreign Currency Contracts [Member]
Maturity of the notional amounts of derivative financial instruments
Remaining Life Less Than 1 Year	258
Remaining Life - 1 - 5 Years	464
Remaining Life - 6 - 10 Years	1,345
Remaining Life - 11 - 30 Years	1,851
Remaining Life - Over 30 Years	42
Remaining Life - Total Years	3,960
Equity Market Contracts [Member]
Maturity of the notional amounts of derivative financial instruments
Remaining Life Less Than 1 Year	52,913
Remaining Life - 1 - 5 Years	15,699
Remaining Life - 6 - 10 Years	7,297
Remaining Life - 11 - 30 Years	11
Remaining Life - Over 30 Years	8,671
Remaining Life - Total Years	84,591
Credit Contracts [Member]
Maturity of the notional amounts of derivative financial instruments
Remaining Life - 1 - 5 Years	27
Remaining Life - Total Years	$ 27