Revenue Recognition - Contract Costs (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Acquisition Costs
Capitalized Contract Cost [Line Items]
Beginning of period balance	$ 62	$ 68	$ 64	$ 73
Costs incurred	13	12	38	36
Amortization	(13)	(14)	(40)	(43)
End of period balance	62	66	62	66
Fulfillment Costs
Capitalized Contract Cost [Line Items]
Beginning of period balance	47	49	47	54
Costs incurred	9	7	28	19
Amortization	(10)	(9)	(29)	(26)
End of period balance	$ 46	$ 47	$ 46	$ 47