Pensions and Other Postretirement Benefits - Accumulated Benefit Obligations and Projected Benefit Obligations (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
U.S.
ABO and PBO [Line Items]
ABO	$ 39,191	$ 40,126
Plans with ABO in excess of plan assets
ABO	4,188	40,126
Fair Value of Plan Assets	3,408	38,298
Plans with PBO in excess of plan assets
PBO	4,206	40,141
Fair Value of Plan Assets	3,408	38,298
Non-U.S.
ABO and PBO [Line Items]
ABO	11,914	11,516
Plans with ABO in excess of plan assets
ABO	4,510	4,267
Fair Value of Plan Assets	64	298
Plans with PBO in excess of plan assets
PBO	4,686	4,396
Fair Value of Plan Assets	$ 108	$ 338

Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-5

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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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
-Paragraph 17
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480482/715-20-55-17

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org/1943274/2147480506/715-20-50-3

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

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

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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