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Employee Benefits - Components of Net Periodic (Benefit) Cost (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Mar. 31, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
U.K.          
Defined Benefit Plan Disclosure [Line Items]          
Service cost $ 0   $ 0 $ 0 $ 0
Interest cost 20   16 64 49
Expected return on plan assets, net of administration expenses (32)   (34) (102) (103)
Amortization of prior-service cost 1   1 2 3
Amortization of net actuarial loss 7   8 22 24
Net periodic (benefits) cost (4)   (9) (14) (27)
Loss on pension settlement 0   0 0 0
Total net periodic (benefit) cost (4)   (9) (14) (27)
Other          
Defined Benefit Plan Disclosure [Line Items]          
Service cost 0   0 0 0
Interest cost 5   3 14 9
Expected return on plan assets, net of administration expenses (8)   (8) (25) (24)
Amortization of prior-service cost 0   0 0 0
Amortization of net actuarial loss 3   4 10 11
Net periodic (benefits) cost     (1) (1) (4)
Loss on pension settlement 0   0 0 0
Total net periodic (benefit) cost 0   (1) (1) (4)
U.S.          
Defined Benefit Plan Disclosure [Line Items]          
Service cost 0   0 0 0
Interest cost 17   15 51 43
Expected return on plan assets, net of administration expenses (27)   (33) (81) (97)
Amortization of prior-service cost 0   0 0 0
Amortization of net actuarial loss 17   19 50 58
Net periodic (benefits) cost 7   1 20 4
Loss on pension settlement 0 $ 1 0 1 0
Total net periodic (benefit) cost $ 7   $ 1 $ 21 $ 4