Revenue from Contracts with Customers - Contract Assets Rollforward (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Capitalized Cost To Fulfill Customer Contracts
Change in Capitalized Contract Costs
Balance at beginning of period	$ 257	$ 254	$ 355	$ 361
Additions	355	354	717	702
Amortization	(373)	(361)	(835)	(818)
Impairment	0	0	0	0
Foreign currency translation and other	3	(8)	5	(6)
Balance at end of period	242	239	242	239
Capitalized Cost To Obtain Customer Contracts
Change in Capitalized Contract Costs
Balance at beginning of period	183	184	185	179
Additions	13	12	23	27
Amortization	(13)	(12)	(25)	(24)
Impairment	0	0	0	0
Foreign currency translation and other	3	(2)	3	0
Balance at end of period	$ 186	$ 182	$ 186	$ 182