Derivative Instruments (Maturity Of The Notional Amounts Of Derivative Financial Instruments) (Details) $ in Millions	Mar. 31, 2022 USD ($)
Maturity of the notional amounts of derivative financial instruments
Remaining Life Less Than 1 Year	$ 79,242
Remaining Life - 1 - 5 Years	49,998
Remaining Life - 6 - 10 Years	29,280
Remaining Life - 11 - 30 Years	18,318
Remaining Life - Over 30 Years	9,017
Remaining Life - Total Years	185,855
Interest Rate Contracts [Member]
Maturity of the notional amounts of derivative financial instruments
Remaining Life Less Than 1 Year	25,425
Remaining Life - 1 - 5 Years	29,454
Remaining Life - 6 - 10 Years	19,844
Remaining Life - 11 - 30 Years	16,315
Remaining Life - Total Years	91,038
Foreign Currency Contracts [Member]
Maturity of the notional amounts of derivative financial instruments
Remaining Life Less Than 1 Year	294
Remaining Life - 1 - 5 Years	556
Remaining Life - 6 - 10 Years	1,627
Remaining Life - 11 - 30 Years	1,992
Remaining Life - Over 30 Years	94
Remaining Life - Total Years	4,563
Equity Market Contracts [Member]
Maturity of the notional amounts of derivative financial instruments
Remaining Life Less Than 1 Year	53,523
Remaining Life - 1 - 5 Years	19,963
Remaining Life - 6 - 10 Years	7,778
Remaining Life - 11 - 30 Years	11
Remaining Life - Over 30 Years	8,923
Remaining Life - Total Years	90,198
Credit Contracts [Member]
Maturity of the notional amounts of derivative financial instruments
Remaining Life - 1 - 5 Years	25
Remaining Life - 6 - 10 Years	31
Remaining Life - Total Years	$ 56