Employee Benefits - Components of Net Periodic (Benefit) Cost (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2023	Jun. 30, 2022
U.K.
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 0		$ 0	$ 0
Interest cost	36	21		72	44
Expected return on plan assets, net of administration expenses	(48)	(34)		(94)	(70)
Amortization of prior-service cost	1	0		1	1
Amortization of net actuarial loss	19	8		37	15
Net periodic (benefit) cost	8	(5)		16	(10)
Loss on pension settlement	0	0		0	0
Total net periodic (benefit) cost	8	(5)		16	(10)
Other
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0		0	0
Interest cost	10	4		20	9
Expected return on plan assets, net of administration expenses	(12)	(8)		(24)	(17)
Amortization of prior-service cost	0	0		0	0
Amortization of net actuarial loss	4	3		7	7
Net periodic (benefit) cost	2	(1)		3	(1)
Loss on pension settlement	27	0		27	0
Total net periodic (benefit) cost	29	(1)		30	(1)
U.S.
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0		0	0
Interest cost	26	17		52	34
Expected return on plan assets, net of administration expenses	(30)	(27)		(60)	(54)
Amortization of prior-service cost	0	0		0	0
Amortization of net actuarial loss	8	17		17	33
Net periodic (benefit) cost	4	7		9	13
Loss on pension settlement	0	0	$ 1	0	1
Total net periodic (benefit) cost	$ 4	$ 7		$ 9	$ 14