Income Taxes Income Taxes - Gross Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Contingency [Line Items]
Unrecognized Tax Benefits, Beginning Balance	$ 395	$ 426	$ 749
Decreases related to positions taken on items from prior years	(7)	(14)	(167)
Increases related to positions taken on items from prior years	13	5	77
Increases related to positions taken in the current year	9	6	54
Settlement of uncertain tax positions with tax authorities	(17)	(18)	(9)
Unrecognized Tax Benefits, Impact of Internal Reorganizations	0	0	(278)
Decreases due to expiration of statutes of limitations	(16)	(7)	0
Exchange (gain) loss	0	(3)	0
Unrecognized Tax Benefits, Ending Balance	377	395	426
Total unrecognized tax benefits that, if recognized, would impact the effective tax rate	157	156	188
Total amount of interest and penalties (benefit) recognized in Provision for income taxes on continuing operations	1	(2)	(4)
Total accrual for interest and penalties associated with unrecognized tax benefits	11	$ 18	$ 24
Tax, Advance deposits made to foreign taxing authority	102
Undistributed Earnings of Foreign Subsidiaries	$ 3,681