Revenue Recognition - Change in Unbilled Contract and Unearned Revenues (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Unbilled contract revenue
Beginning balance	$ 80	$ 35	$ 11
Additions	2	324	242
Subtractions	78	279	218
Ending balance	4	80	35
Unearned revenue
Beginning balance	3	7	41
Additions	0	0	0
Subtractions	3	4	34
Ending balance	0	3	7
Contracts with customer, revenue recognized, amount outstanding end of last period	$ 3	$ 4	$ 34