Employee Benefits - Summary of Employer Contributions (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Defined Benefit Plan Disclosure [Line Items]
Company’s benefit pension plans	$ 11	$ 12	$ 40	$ 62
U.K.
Defined Benefit Plan Disclosure [Line Items]
Company’s benefit pension plans	2	2	5	6
Other
Defined Benefit Plan Disclosure [Line Items]
Company’s benefit pension plans	2	2	10	10
U.S.
Defined Benefit Plan Disclosure [Line Items]
Company’s benefit pension plans	$ 7	$ 8	$ 25	$ 46