Revenue from Contracts with Customers - Contract Assets Rollforward (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Capitalized Cost To Fulfill Customer Contracts
Change in Capitalized Contract Costs
Balance at beginning of period	$ 361	$ 339
Additions	348	346
Amortization	(457)	(443)
Impairment	0	0
Foreign currency translation and other	2	(1)
Balance at end of period	254	241
Capitalized Cost To Obtain Customer Contracts
Change in Capitalized Contract Costs
Balance at beginning of period	179	184
Additions	15	13
Amortization	(12)	(12)
Impairment	0	0
Foreign currency translation and other	2	0
Balance at end of period	$ 184	$ 185