Retirement Benefits - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 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	$ 42	$ 41	$ 85	$ 81
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		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		1
Pension Plan [Member] \| Other Foreign Plans [Member]
Compensation and Retirement Disclosure [Line Items]
Defined benefit pension plans, employer contributions			11
Defined benefit plan, estimated future employer additional contributions, remainder of fiscal year	$ 4		$ 4