Income Taxes (Net Provision For Income Taxes For Continuing Operations) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019		Dec. 31, 2018
Current:
U.S. federal	$ 558	$ 471		$ 587
State	8	36		48
Foreign	132	119		95
Total current	698	626		730
Deferred:
U.S. federal	(130)	49		(37)
State	(2)	1		8
Foreign	5	42		26
Total deferred	(127)	92		(3)
Provision for income taxes, net	571	718	[1]	727	[1]
Net income tax payments	$ 764	$ 572		$ 532

[1] *Prior-period information has been restated for the retrospective application of a change in accounting principle related to the amortization of actuarial gains and losses for our qualified U.S. government pension plans, which we adopted in the fourth quarter of 2020. For further discussion of this change in accounting principle, see Note T to the Consolidated Financial Statements.