Retirement Benefits - Accumulated and Projected Benefit Obligations for the Plans (Details) - Pension Benefit Plans - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
United States
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	$ 3,809	$ 5,140
Projected benefit obligation	3,809	5,140
Fair value of plan assets	3,076	4,157
Non U.S.
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation	1,206	1,933
Projected benefit obligation	1,207	1,935
Fair value of plan assets	$ 1,092	$ 1,870

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 3
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
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-Section 55
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