Revenue Recognition - Change in Unbilled Contract and Unearned Revenues (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Unbilled contract revenue
Beginning balance	$ 35	$ 11	$ 29
Additions	324	242	88
Subtractions	279	218	106
Ending balance	80	35	11
Unearned revenue
Beginning balance	7	41	17
Additions	0	0	31
Subtractions	4	34	7
Ending balance	3	7	41
Contracts with customer, revenue recognized, amount outstanding end of last period	$ 4	$ 34	$ 7