Expenses - Restructuring Reserve (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Restructuring Reserve [Roll Forward]
Beginning balance	$ 208	$ 88	$ 74
Net repositioning benefit	(2)	203	78
Payments and Other Adjustments	(110)	(83)	(64)
Ending balance	96	208	88
Employee Related Costs
Restructuring Reserve [Roll Forward]
Beginning balance	207	83	68
Net repositioning benefit	(15)	182	58
Payments and Other Adjustments	(96)	(58)	(43)
Ending balance	96	207	83
Real Estate Actions
Restructuring Reserve [Roll Forward]
Beginning balance	1	5	6
Net repositioning benefit	13	21	20
Payments and Other Adjustments	(14)	(25)	(21)
Ending balance	$ 0	$ 1	$ 5