Employee Benefits - Components of Net Periodic (Benefit) Cost (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
U.K.
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 0
Interest cost	23	16
Expected return on plan assets, net of administration expenses	(36)	(34)
Amortization of prior-service cost	1	1
Amortization of net actuarial loss	7	8
Net periodic (benefits) cost	(5)	(9)
Loss on pension settlement	0	0
Total net periodic (benefit) cost	(5)	(9)
Other
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0
Interest cost	5	3
Expected return on plan assets, net of administration expenses	(9)	(8)
Amortization of prior-service cost	0	0
Amortization of net actuarial loss	4	4
Net periodic (benefits) cost		(1)
Loss on pension settlement	0	0
Total net periodic (benefit) cost	0	(1)
U.S.
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0
Interest cost	17	14
Expected return on plan assets, net of administration expenses	(27)	(32)
Amortization of prior-service cost	0	0
Amortization of net actuarial loss	16	19
Net periodic (benefits) cost	6	1
Loss on pension settlement	1	0
Total net periodic (benefit) cost	$ 7	$ 1