Income Taxes - Reconciliation of the beginning and ending amount of unrecognized tax benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Reconciliation of the Company's beginning and ending amount of unrecognized tax benefits
Balance at the beginning of the period	$ 321	$ 299
Additions based on tax positions related to the current year	33	25
Additions for tax positions of prior years	7	7
Reductions for tax positions of prior years	(4)	(3)
Settlements	0	0
Business combinations	0	0
Lapse of statute of limitations	(10)	(7)
Foreign currency translation	0	0
Balance at the end of the period	$ 347	$ 321