Employee Benefit Plans - Plan Amendments (Details) £ in Millions, $ in Millions	1 Months Ended			12 Months Ended
	Apr. 30, 2023 USD ($)	Apr. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2023 GBP (£)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Increase to PBO		$ 72
U.K.
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension award payment percentage	6.50%	7.50%
Increase to PBO	$ 36
Pension Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Cost before equalization				$ 22		£ 17
Pension Plan | United States
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Increase to PBO				0	$ 0
Pension Plan | Non-U.S.
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Increase to PBO				36	72
Retiree Health
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Increase to PBO				$ (3)	(26)
Retiree Health | United States
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Accumulated benefit obligation, decrease for plan amendment			$ 50		$ 30