Derivative Instruments (Maturity Of The Notional Amounts Of Derivative Financial Instruments) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Maturity of the notional amounts of derivative financial instruments
Remaining Life Less Than 1 Year	$ 62,823
Remaining Life - 1 - 5 Years	68,201
Remaining Life - 6 - 10 Years	27,165
Remaining Life - 11 - 30 Years	16,234
Remaining Life Over - 30 Years	9,898
Remaining Life - Total Years	184,321	$ 216,826
Interest Rate Contracts [Member]
Maturity of the notional amounts of derivative financial instruments
Remaining Life Less Than 1 Year	4,413
Remaining Life - 1 - 5 Years	49,847
Remaining Life - 6 - 10 Years	17,324
Remaining Life - 11 - 30 Years	14,368
Remaining Life Over - 30 Years	1,213
Remaining Life - Total Years	$ 87,165
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	$ 410
Remaining Life - 1 - 5 Years	553
Remaining Life - 6 - 10 Years	1,574
Remaining Life - 11 - 30 Years	1,856
Remaining Life Over - 30 Years	73
Remaining Life - Total Years	$ 4,466
Derivative maturity date	Jun. 16, 2061
Equity market contracts [Member]
Maturity of the notional amounts of derivative financial instruments
Remaining Life Less Than 1 Year	$ 58,000
Remaining Life - 1 - 5 Years	17,752
Remaining Life - 6 - 10 Years	8,267
Remaining Life - 11 - 30 Years	10
Remaining Life Over - 30 Years	8,612
Remaining Life - Total Years	92,641
Credit contracts [Member]
Maturity of the notional amounts of derivative financial instruments
Remaining Life - 1 - 5 Years	49
Remaining Life - Total Years	$ 49