Employee Benefits - Amounts Recognized in Accumulated Other Comprehensive Loss That Have Not Yet Been Recognized (Details) - Pension Plan - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
U.K.
Amounts recognized in Accumulated other comprehensive loss unrecognized as components of net periodic benefit cost
Net loss	$ 1,893	$ 1,854
Prior service cost (income)	48	43
Net amount recognized	1,941	1,897
Other
Amounts recognized in Accumulated other comprehensive loss unrecognized as components of net periodic benefit cost
Net loss	473	419
Prior service cost (income)	(6)	(5)
Net amount recognized	467	414
U.S.
Amounts recognized in Accumulated other comprehensive loss unrecognized as components of net periodic benefit cost
Net loss	1,304	1,276
Prior service cost (income)	0	0
Net amount recognized	$ 1,304	$ 1,276