Income Taxes - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Net operating loss and capital loss carryforwards	$ 416	$ 568
Valuation allowance	325	454
Income tax penalties and interest expense	40	34	$ 49
Income tax penalties and interest accrued	151	$ 121
Unrecognized tax benefits that would impact effective tax rate	$ 669