Employee Benefits - Components of Net Periodic (Benefit) Cost (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
U.K.
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 0
Interest cost	35	36
Expected return on plan assets, net of administration expenses	(47)	(46)
Amortization of prior-service cost	1	0
Amortization of net actuarial loss	20	18
Net periodic (benefit) cost	9	8
Loss on pension settlement	0	0
Total net periodic (benefit) cost	9	8
Other
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0
Interest cost	9	10
Expected return on plan assets, net of administration expenses	(13)	(12)
Amortization of prior-service cost	0	0
Amortization of net actuarial loss	3	3
Net periodic (benefit) cost	(1)	1
Loss on pension settlement	0	0
Total net periodic (benefit) cost	(1)	1
U.S.
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0
Interest cost	23	26
Expected return on plan assets, net of administration expenses	(33)	(30)
Amortization of prior-service cost	0	0
Amortization of net actuarial loss	7	9
Net periodic (benefit) cost	(3)	5
Loss on pension settlement	0	0
Total net periodic (benefit) cost	$ (3)	$ 5