Employment Benefit Plans Change in Benefit Obligation (Details) - Pension Benefits - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Projected benefit obligation at beginning of period	$ 1,739	$ 1,678
Service cost	11	10	$ 18
Interest cost	83	84	62
Actuarial loss (gain)	(78)	106
Benefits paid	(138)	(137)
Settlements	(1)	(2)
Projected benefit obligation at end of period	1,616	1,739	$ 1,678
Component representing future salary increases	(13)	(9)
Accumulated benefit obligation at end of period	$ 1,603	$ 1,730