Goodwill, Customer Relationships and Other Intangible Assets - Goodwill Activity (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Jun. 30, 2023	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Goodwill [Roll Forward]
Beginning balance		$ 0	$ 1,970
Impairment	$ (2,000)	0	(1,970)	$ (4,638)
Ending balance		$ 0	$ 0	1,970
Accumulated impairment loss				$ 8,200