Derivative Instruments (Maturity Of The Notional Amounts Of Derivative Financial Instruments) (Details) $ in Millions	Sep. 30, 2021 USD ($)
Maturity of the notional amounts of derivative financial instruments
Remaining Life Less Than 1 Year	$ 61,902
Remaining Life - 1 - 5 Years	66,453
Remaining Life - 6 - 10 Years	24,609
Remaining Life - 11 - 30 Years	16,223
Remaining Life - Over 30 Years	8,779
Remaining Life - Total Years	177,966
Interest Rate Contracts [Member]
Maturity of the notional amounts of derivative financial instruments
Remaining Life Less Than 1 Year	2,508
Remaining Life - 1 - 5 Years	49,605
Remaining Life - 6 - 10 Years	16,004
Remaining Life - 11 - 30 Years	12,868
Remaining Life - Total Years	80,985
Foreign Currency Contracts [Member]
Maturity of the notional amounts of derivative financial instruments
Remaining Life Less Than 1 Year	195
Remaining Life - 1 - 5 Years	563
Remaining Life - 6 - 10 Years	1,582
Remaining Life - 11 - 30 Years	1,732
Remaining Life - Over 30 Years	42
Remaining Life - Total Years	4,114
Equity Market Contracts [Member]
Maturity of the notional amounts of derivative financial instruments
Remaining Life Less Than 1 Year	59,199
Remaining Life - 1 - 5 Years	16,253
Remaining Life - 6 - 10 Years	7,023
Remaining Life - 11 - 30 Years	1,623
Remaining Life - Over 30 Years	8,737
Remaining Life - Total Years	92,835
Credit Contracts [Member]
Maturity of the notional amounts of derivative financial instruments
Remaining Life - 1 - 5 Years	32
Remaining Life - Total Years	$ 32