Revenue from Contracts with Customers - Contract Assets Rollforward (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Capitalized Cost To Fulfill Customer Contracts
Change in Capitalized Contract Costs
Balance at beginning of period	$ 254	$ 241	$ 361	$ 339
Additions	354	336	702	682
Amortization	(361)	(357)	(818)	(800)
Impairment	0	0	0	0
Foreign currency translation and other	(8)	2	(6)	1
Balance at end of period	239	222	239	222
Capitalized Cost To Obtain Customer Contracts
Change in Capitalized Contract Costs
Balance at beginning of period	184	185	179	184
Additions	12	15	27	28
Amortization	(12)	(13)	(24)	(25)
Impairment	0	0	0	0
Foreign currency translation and other	(2)	(12)	0	(12)
Balance at end of period	$ 182	$ 175	$ 182	$ 175