Revenue Recognition - Contract Cost (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 [Roll Forward]
Beginning of period balance	$ 78	$ 75	$ 76	$ 78
Costs incurred	16	15	45	44
Amortization	(14)	(14)	(41)	(46)
Change in contract costs held for sale	0	0	0	0
End of period balance	80	76	80	76
Fulfillment Costs
Capitalized Contract Cost [Roll Forward]
Beginning of period balance	101	124	99	122
Costs incurred	20	22	63	68
Amortization	(17)	(21)	(57)	(65)
Change in contract costs held for sale	1	(27)	0	(27)
End of period balance	105	$ 98	105	$ 98
Fulfillment Costs | Discontinued Operations, Held-for-sale
Capitalized Contract Cost [Roll Forward]
Beginning of period balance	$ 28		$ 27