Income Taxes (Components Of Provision For Income Taxes) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current tax expense:
Federal	$ 1,019	$ 1,128	$ 1,356
State and local	84	78	39
Total current tax expense	1,103	1,206	1,395
Deferred tax expense (benefit)	75	112	(1,274)
Total income tax expense	$ 1,178	$ 1,318	$ 121