Revenue from Contracts with Customers - Contract Assets Rollforward (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Capitalized Cost To Fulfill Customer Contracts
Change in Capitalized Contract Costs
Balance at beginning of period	$ 339	$ 335
Additions	1,504	1,360
Amortization	(1,478)	(1,360)
Impairment	0	0
Foreign currency translation and other	(4)	4
Balance at end of period	361	339
Capitalized Cost To Obtain Customer Contracts
Change in Capitalized Contract Costs
Balance at beginning of period	184	171
Additions	59	61
Amortization	(48)	(47)
Impairment	0	0
Foreign currency translation and other	(16)	(1)
Balance at end of period	$ 179	$ 184