Derivative Instruments (Maturity Of The Notional Amounts Of Derivative Financial Instruments) (Details) $ in Millions	6 Months Ended
	Jun. 30, 2019 USD ($)
Maturity of the notional amounts of derivative financial instruments
Remaining Life Less Than 1 Year	$ 36,697
Remaining Life - 1 - 5 Years	15,546
Remaining Life - 6 - 10 Years	56,765
Remaining Life - 11 - 30 Years	27,359
Remaining Life Over - 30 Years	4,920
Remaining Life - Total Years	141,287
Interest Rate Contracts [Member]
Maturity of the notional amounts of derivative financial instruments
Remaining Life Less Than 1 Year	11,663	[1]
Remaining Life - 1 - 5 Years	10,031	[1]
Remaining Life - 6 - 10 Years	53,055	[1]
Remaining Life - 11 - 30 Years	26,001	[1]
Remaining Life Over - 30 Years	1,713	[1]
Remaining Life - Total Years	$ 102,463	[1]
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	$ 304	[2]
Remaining Life - 1 - 5 Years	255	[2]
Remaining Life - 6 - 10 Years	831	[2]
Remaining Life - 11 - 30 Years	1,345	[2]
Remaining Life Over - 30 Years	68	[2]
Remaining Life - Total Years	$ 2,803	[2]
Derivative maturity date	Feb. 20, 2050
Equity market contracts [Member]
Maturity of the notional amounts of derivative financial instruments
Remaining Life Less Than 1 Year	$ 24,730
Remaining Life - 1 - 5 Years	5,260
Remaining Life - 6 - 10 Years	2,879
Remaining Life - 11 - 30 Years	13
Remaining Life Over - 30 Years	3,139
Remaining Life - Total Years	$ 36,021

[1] As of June 30, 2019, the latest maturity date for which we were hedging our exposure to the variability in future cash flows for these instruments was April 20, 2067.

[2] As of June 30, 2019, the latest maturity date for which we were hedging our exposure to the variability in future cash flows for these instruments was February 20, 2050.