Revenue from Contracts with Customers - Contract Assets Rollforward (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Capitalized Cost To Fulfill Customer Contracts
Change in Capitalized Contract Costs
Balance at beginning of period	$ 370	$ 355
Additions	1,725	1,532
Amortization	(1,659)	(1,522)
Impairment	0	0
Foreign currency translation and other	(12)	5
Balance at end of period	424	370
Capitalized Cost To Obtain Customer Contracts
Change in Capitalized Contract Costs
Balance at beginning of period	195	185
Additions	73	57
Amortization	(54)	(51)
Impairment	0	0
Foreign currency translation and other	(7)	4
Balance at end of period	$ 207	$ 195