Revenue from Contracts with Customers - Contract Assets Rollforward (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Capitalized Cost To Fulfill Customer Contracts
Change in Capitalized Contract Costs
Balance at beginning of period	$ 242	$ 239	$ 355	$ 361
Additions	357	320	1,074	1,022
Amortization	(321)	(291)	(1,156)	(1,109)
Impairment	0	0	0	0
Foreign currency translation and other	(5)	(12)	0	(18)
Balance at end of period	273	256	273	256
Capitalized Cost To Obtain Customer Contracts
Change in Capitalized Contract Costs
Balance at beginning of period	186	182	185	179
Additions	14	8	37	35
Amortization	(13)	(12)	(38)	(36)
Impairment	0	0	0	0
Foreign currency translation and other	(1)	(2)	2	(2)
Balance at end of period	$ 186	$ 176	$ 186	$ 176