Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
SEC Schedule, 12-09, Allowance, Credit Loss [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period		$ 208	$ 174	$ 127
Additions charged to expenses	[1]	6	52	69
Deductions from reserves	[1],[2]	(4)	(18)	(22)
Balance at end of period		210	208	174
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member]
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period		453	457	669
Additions charged to expenses		97	56	20
Deductions from reserves	[3]	(184)	(60)	(232)
Balance at end of period		$ 366	$ 453	$ 457

[1] Classifications in the changes in the allowance for doubtful receivables for the period ended December 31, 2020 have been adjusted from their previous presentation. Adjustments did not impact the amount of the provision or the allowance for doubtful receivables recorded in the Consolidated Statements of Operations or the Consolidated Balance Sheets.

[2] Deductions include write-offs, recoveries collected and currency translation adjustments.

[3] Deductions include currency translation adjustments.