Revenue from Contracts with Customers - Contract Assets Rollforward (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Capitalized Cost To Fulfill Customer Contracts
Change in Capitalized Contract Costs
Balance at beginning of period	$ 355	$ 361
Additions	1,532	1,479
Amortization	(1,522)	(1,480)
Impairment	0	0
Foreign currency translation and other	5	(5)
Balance at end of period	370	355
Capitalized Cost To Obtain Customer Contracts
Change in Capitalized Contract Costs
Balance at beginning of period	185	179
Additions	57	56
Amortization	(51)	(49)
Impairment	0	0
Foreign currency translation and other	4	(1)
Balance at end of period	$ 195	$ 185