Employee Benefits - Schedule of changes in Level 3 fair value for U.K. Pension Plans (Details) - Pension Plan - U.K. - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Actual return on plan assets:
Balance at the beginning of the period	$ 3,775	$ 3,537
Foreign exchange	(51)	196
Balance at the end of the period	3,291	3,775
Significant Unobservable Inputs (Level 3)
Actual return on plan assets:
Balance at the beginning of the period	1,510	1,403
Relating to assets still held at the end of the year	(157)	30
Foreign exchange	(24)	77
Balance at the end of the period	$ 1,329	$ 1,510