Revenue Recognition - Contract Costs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Acquisition Costs
Capitalized Contract Cost [Roll Forward]
Beginning of period balance	$ 76	$ 76
Costs incurred	55	61
Amortization	(57)	(55)
Change in contract costs held for sale	(4)
Classified as held for sale		(6)
End of period balance	70	76
Fulfillment Costs
Capitalized Contract Cost [Roll Forward]
Beginning of period balance	106	99
Costs incurred	87	83
Amortization	(69)	(76)
Change in contract costs held for sale	(27)
Classified as held for sale		0
End of period balance	$ 97	$ 106