Income Taxes (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating Loss Carryforwards [Line Items]
Net operating and capital loss carryforwards (tax effected) for federal income tax purposes	$ 892
Net operating and capital loss carryforwards (tax effected) for state income tax purposes	747
Net operating and capital loss carryforwards (tax effected) for foreign income tax purposes	2,441
Amount of deposits that reduced UTB balance	1,767	$ 377
Accrued interest and penalties included in unrecognized tax benefits balance at year end	1,930	2,054
Net interest and penalty expense included in income tax expense	(86)	$ (129)	$ 127
Federal
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards	293
State
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards	$ 1,444