Retirement Benefits - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Compensation and Retirement Disclosure [Line Items]
Portion of pension and OPEB obligation attributed to disclosed plans (as a percent)	98.00%
Defined contribution plan, employer contribution	$ 43	$ 40
Pension Plan [Member] | United States [Member]
Compensation and Retirement Disclosure [Line Items]
Defined benefit pension plans, employer contributions	0
Defined benefit plan, estimated future employer additional contributions, remainder of fiscal year	0
Pension Plan [Member] | United Kingdom [Member]
Compensation and Retirement Disclosure [Line Items]
Defined benefit pension plans, employer contributions	1
Defined benefit plan, estimated future employer additional contributions, remainder of fiscal year	1
Pension Plan [Member] | Other Foreign Plans [Member]
Compensation and Retirement Disclosure [Line Items]
Defined benefit pension plans, employer contributions	9
Defined benefit plan, estimated future employer additional contributions, remainder of fiscal year	$ 6