Other Assets - Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 3,851	$ 3,786
Acquisitions	394	48
Dispositions	(27)	0
Other	(31)	17
Goodwill, ending balance	4,187	3,851
USCS
Goodwill [Roll Forward]
Goodwill, beginning balance	379	379
Acquisitions	394	0
Dispositions	0	0
Other	(1)	0
Goodwill, ending balance	772	379
CS
Goodwill [Roll Forward]
Goodwill, beginning balance	2,151	2,122
Acquisitions	0	30
Dispositions	0	0
Other	(3)	(1)
Goodwill, ending balance	2,148	2,151
ICS
Goodwill [Roll Forward]
Goodwill, beginning balance	743	725
Acquisitions	0	0
Dispositions	0	0
Other	(27)	18
Goodwill, ending balance	716	743
GMNS
Goodwill [Roll Forward]
Goodwill, beginning balance	578	560
Acquisitions	0	18
Dispositions	(27)	0
Other	0	0
Goodwill, ending balance	$ 551	$ 578