Income Taxes - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Tax Contingency [Line Items]
Percentage of temporary tax differences that reverse within the carryforward period	3.00%
Percentage of deferred tax asset exclusive of reversing temporary differences	97.00%
Foreign tax credits	$ 20	$ 68
Increase (decrease) to valuation allowance	21	40	$ 113
Cumulative amount of valuation allowance	90
Valuation allowance	1,821	1,965	2,279	$ 2,307
Income taxes, net of amounts refunded	$ 104	$ 50	$ 53
Percentage of the effect of unrecognized tax benefit, if recorded (less than)	2.00%	1.00%	1.00%
Interest or penalties recognized (less than for 2022 and 2021)	$ 7	$ 1	$ 1
Income related to accrued interest and penalties (less than for 2022)	2	1	3
Amount accrued for payment of interest and penalties (less than for 2022 and 2021)	11	1	1
Other Net State Deferred Tax Asset
Income Tax Contingency [Line Items]
Valuation allowance	438
Foreign Tax Credit Carryover
Income Tax Contingency [Line Items]
Increase (decrease) to valuation allowance	14	12
Domestic Tax Authority
Income Tax Contingency [Line Items]
Increase (decrease) to valuation allowance	(2)	(1)	3
Domestic Tax Authority | Other Net State Deferred Tax Asset
Income Tax Contingency [Line Items]
Increase (decrease) to valuation allowance	$ (49)	(142)	20
Foreign Tax Authority | UK Tax Authority
Income Tax Contingency [Line Items]
Increase (decrease) to valuation allowance		$ (6)
Foreign Tax Authority | Switzerland Tax Authority
Income Tax Contingency [Line Items]
Increase (decrease) to valuation allowance			$ 8