Income Taxes (Changes In Unrecognized Tax Benefits Balance For Federal State And Foreign Tax) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at beginning of year	$ 8,954	$ 9,415
Increases for tax positions related to the current year	1,389	677
Increases for tax positions related to prior years	577	332
Decreases for tax positions related to prior years	(1,079)	(1,169)
Lapse of statute of limitations	(2)	(6)
Settlements	(182)	(295)
Balance at end of year	9,657	8,954
Accrued interest and penalties	1,930	2,054
Gross unrecognized income tax benefits	11,587	11,008
Less: Deferred federal and state income tax benefits	(723)	(728)
Less: Tax attributable to timing items included above	(4,640)	(3,428)
Total UTB that, if recognized, would impact the effective income tax rate as of the end of the year	$ 6,224	$ 6,852