Income Taxes (Components Of Provision For Income Taxes) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current tax expense:
Federal	$ 1,128	$ 1,356	$ 1,862
State and local	78	39	94
Total current tax expense	1,206	1,395	1,956
Deferred tax expense (benefit)	112	(1,274)	129
Total income tax expense	$ 1,318	$ 121	$ 2,085