Retirement Benefits - Accumulated and Projected Benefit Obligations for the Plans (Details) - Pension Benefit Plans - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
United States
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	$ 3,928	$ 3,809
Projected benefit obligation	3,928	3,809
Fair value of plan assets	3,273	3,076
Non U.S.
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	1,346	1,206
Projected benefit obligation	1,347	1,207
Fair value of plan assets	$ 1,172	$ 1,092

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Amount of plan asset for defined benefit pension plan with projected benefit obligation in excess of plan assets.

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Amount of projected benefit obligation for defined benefit pension plan with projected benefit obligation in excess of plan assets.

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Amount of accumulated benefit obligation for defined benefit plan with accumulated benefit obligation in excess of plan assets.

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Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480482/715-20-55-17

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