Derivative Instruments (Maturity Of The Notional Amounts Of Derivative Financial Instruments) (Details) $ in Millions	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	15,313
Remaining Life - 6 - 10 Years	56,765
Remaining Life - 11 - 30 Years	26,644
Remaining Life Over - 30 Years	3,706
Remaining Life - Total Years	139,125
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	25,286	[1]
Remaining Life Over - 30 Years	500	[1]
Remaining Life - Total Years	100,535	[1]
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]
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	5,027
Remaining Life - 6 - 10 Years	2,879
Remaining Life - 11 - 30 Years	13
Remaining Life Over - 30 Years	3,138
Remaining Life - Total Years	$ 35,787

[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 March 17, 2021.

[2] March 17, 2021.⁽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.