Income Taxes - Valuation Allowances Against Deferred Tax Assets (Details) - Deferred tax asset valuation allowance - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Valuation Allowances Against Deferred Tax Assets
Allowances at beginning of year	$ 323	$ 179
Benefits reserved current year	95	133
Benefits recognized current year	(1)	0
Translation difference	(9)	11
Allowances at end of year	$ 408	$ 323