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, 2025	Dec. 31, 2024
Actual return on plan assets:
Balance at the beginning of the period	$ 3,291	$ 3,775
Foreign exchange	252	(51)
Balance at the end of the period	3,437	3,291
Significant Unobservable Inputs (Level 3)
Actual return on plan assets:
Balance at the beginning of the period	1,329	1,510
Relating to assets still held at the end of the year	(19)	(157)
Foreign exchange	104	(24)
Balance at the end of the period	$ 1,414	$ 1,329