Revenue Recognition - Contract Costs (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Acquisition Costs
Capitalized Contract Cost [Line Items]
Beginning Balance	$ 59	$ 62	$ 61	$ 64
Cost Incurred	10	13	32	38
Amortization	(12)	(13)	(36)	(40)
Ending Balances	57	62	57	62
Fulfillment Costs
Capitalized Contract Cost [Line Items]
Beginning Balance	45	47	46	47
Cost Incurred	9	9	28	28
Amortization	(9)	(10)	(29)	(29)
Ending Balances	$ 45	$ 46	$ 45	$ 46