Revenue Recognition - Change in Unbilled Contract and Unearned Revenues (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Unbilled contract revenue
Beginning balance	$ 4	$ 80	$ 35
Additions	0	2	324
Subtractions	0	78	279
Ending balance	4	4	80
Unearned revenue
Beginning balance	0	3	7
Additions	0	0	0
Subtractions	0	3	4
Ending balance	$ 0	0	3
Contracts with customer, revenue recognized, amount outstanding end of last period		$ 3	$ 4