Employee Benefits - Components of Net Periodic (Benefit) Cost (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
U.K.
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 0
Interest cost	36	23
Expected return on plan assets, net of administration expenses	(46)	(36)
Amortization of prior-service cost	0	1
Amortization of net actuarial loss	18	7
Net periodic (benefit) cost	8	(5)
Loss on pension settlement	0	0
Total net periodic (benefit) cost	8	(5)
Other
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0
Interest cost	10	5
Expected return on plan assets, net of administration expenses	(12)	(9)
Amortization of prior-service cost	0	0
Amortization of net actuarial loss	3	4
Net periodic (benefit) cost	1
Loss on pension settlement	0	0
Total net periodic (benefit) cost	1	0
U.S.
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0
Interest cost	26	17
Expected return on plan assets, net of administration expenses	(30)	(27)
Amortization of prior-service cost	0	0
Amortization of net actuarial loss	9	16
Net periodic (benefit) cost	5	6
Loss on pension settlement	0	1
Total net periodic (benefit) cost	$ 5	$ 7