Employee Benefits - Summary of Employer Contributions (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Company’s benefit pension plans	$ 29	$ 50
U.K.
Defined Benefit Plan Disclosure [Line Items]
Company’s benefit pension plans	3	4
Other
Defined Benefit Plan Disclosure [Line Items]
Company’s benefit pension plans	8	8
U.S.
Defined Benefit Plan Disclosure [Line Items]
Company’s benefit pension plans	$ 18	$ 38