Employee Benefits - Schedule of Components of Net Periodic (Benefit) Cost (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
U.K.
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 0
Interest cost	37	37
Expected return on plan assets, net of administration expenses	(48)	(43)
Amortization of prior-service cost	0	1
Amortization of net actuarial loss	20	22
Net periodic cost (benefit)	9	17
Other
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0
Interest cost	11	9
Expected return on plan assets, net of administration expenses	(15)	(12)
Amortization of prior-service cost	0	0
Amortization of net actuarial loss	4	3
Net periodic cost (benefit)	0	0
U.S.
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0
Interest cost	24	26
Expected return on plan assets, net of administration expenses	(30)	(30)
Amortization of prior-service cost	0	0
Amortization of net actuarial loss	11	9
Net periodic cost (benefit)	$ 5	$ 5