Income Taxes (Summary of Valuation Allowance) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Valuation Allowance [Line Items]
Tax credit carryforwards, Deferred tax asset (liability)	$ 1,014	$ 1,786
Total U.S. federal and state tax loss carryforwards, Deferred tax asset (liability)	422
Total U.S. federal and state tax loss carryforwards, Valuation allowance	(130)
Total U.S. federal and state tax loss carryforwards, Net deferred tax asset (liability)	292
Other net deferred tax liabilities	(353)
Other net deferred tax liabilities, Valuation allowance	0
Net deferred tax assets (liabilities), Deferred tax asset (liability)	1,083
Net deferred tax assets (liabilities), Valuation allowance	(839)	(835)
Net deferred tax assets (liabilities), net of deferred tax (liabilities) assets	244	$ 2
Foreign tax credits
Valuation Allowance [Line Items]
Tax credit carryforwards, Deferred tax asset (liability)	1,014
Tax credit carryforwards, Valuation allowance	(709)
Tax credit carryforwards, Net deferred tax asset (liability)	305
Federal
Valuation Allowance [Line Items]
Tax loss carryforwards, Deferred tax asset (liability)	256
Tax loss carryforwards, Valuation allowance	0
Tax loss carryforwards, Net deferred tax asset (liability)	256
State
Valuation Allowance [Line Items]
Tax loss carryforwards, Deferred tax asset (liability)	166
Tax loss carryforwards, Valuation allowance	(130)
Tax loss carryforwards, Net deferred tax asset (liability)	$ 36