Employee Benefits - Reconciliation of the Changes in the Benefit Obligations and Fair Value of Assets and a Statement of the Funded Status (Details) - Pension Plan - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
U.K.
Change in projected benefit obligation
Balance at the beginning of the Period	$ 3,233	$ 2,946
Service cost	0	0	$ 1
Interest cost	145	147	83
Plan amendment	7	5
Settlements	0	0
Actuarial (gain) loss	(353)	143
Benefit payments	(176)	(173)
Foreign currency impact	(43)	165
Balance at the end of the period	2,813	3,233	2,946
Accumulated benefit obligation at end of year	2,813	3,233
Change in fair value of plan assets
Balance at the beginning of the period	3,775	3,537
Actual return on plan assets	(261)	211
Employer contributions	4	4
Settlements	0	0
Benefit payments	(176)	(173)
Foreign currency impact	(51)	196
Balance at the end of the period	3,291	3,775	3,537
Market related value at end of year	3,291	3,775
Funded status	478	542
Unrecognized prior-service cost	43	39
Unrecognized loss	1,854	1,870
Net amount recognized	2,375	2,451
Other
Change in projected benefit obligation
Balance at the beginning of the Period	1,129	1,094
Service cost	0	0	0
Interest cost	39	41	19
Plan amendment	0	0
Settlements	0	(63)
Actuarial (gain) loss	36	63
Benefit payments	(44)	(44)
Foreign currency impact	(73)	38
Balance at the end of the period	1,087	1,129	1,094
Accumulated benefit obligation at end of year	1,077	1,117
Change in fair value of plan assets
Balance at the beginning of the period	1,069	1,032
Actual return on plan assets	65	93
Employer contributions	11	14
Settlements	0	(63)
Benefit payments	(44)	(44)
Foreign currency impact	(69)	37
Balance at the end of the period	1,032	1,069	1,032
Market related value at end of year	1,032	1,069
Funded status	(55)	(60)
Unrecognized prior-service cost	(5)	(5)
Unrecognized loss	419	436
Net amount recognized	359	371
U.S.
Change in projected benefit obligation
Balance at the beginning of the Period	2,199	2,180
Service cost	0	0	0
Interest cost	100	103	73
Plan amendment	0	0
Settlements	0	3
Actuarial (gain) loss	(116)	51
Benefit payments	(143)	(138)
Foreign currency impact	0	0
Balance at the end of the period	2,040	2,199	2,180
Accumulated benefit obligation at end of year	2,040	2,199
Change in fair value of plan assets
Balance at the beginning of the period	1,499	1,481
Actual return on plan assets	26	121
Employer contributions	43	32
Settlements	0	3
Benefit payments	(143)	(138)
Foreign currency impact	0	0
Balance at the end of the period	1,425	1,499	$ 1,481
Market related value at end of year	1,731	1,788
Funded status	(615)	(700)
Unrecognized prior-service cost	0	0
Unrecognized loss	1,276	1,319
Net amount recognized	$ 661	$ 619