Employee Benefits - Schedule of Components of Net Periodic (Benefit) Cost (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
U.K.
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 0	$ 0	$ 0
Interest cost	36	36	71	72
Expected return on plan assets, net of administration expenses	(47)	(48)	(94)	(94)
Amortization of prior-service cost	0	1	1	1
Amortization of net actuarial loss	21	19	41	37
Net periodic (benefit) cost	10	8	19	16
Loss on pension settlement	0	0	0	0
Total net periodic (benefit) cost	10	8	19	16
Other
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	0	0
Interest cost	10	10	19	20
Expected return on plan assets, net of administration expenses	(14)	(12)	(27)	(24)
Amortization of prior-service cost	0	0	0	0
Amortization of net actuarial loss	3	4	6	7
Net periodic (benefit) cost	(1)	2	(2)	3
Loss on pension settlement	0	27	0	27
Total net periodic (benefit) cost	(1)	29	(2)	30
U.S.
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	0	0
Interest cost	23	26	46	52
Expected return on plan assets, net of administration expenses	(35)	(30)	(68)	(60)
Amortization of prior-service cost	0	0	0	0
Amortization of net actuarial loss	8	8	15	17
Net periodic (benefit) cost	(4)	4	(7)	9
Loss on pension settlement	0	0	0	0
Total net periodic (benefit) cost	$ (4)	$ 4	$ (7)	$ 9