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Retirement Programs - Plans Where the ABO Exceeds Plan Assets Fair Value (Details) - Pensions - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
U.S.
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation ("ABO")	$ 2,518	$ 2,464
Fair value of plan assets	2,180	2,048
International
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation ("ABO")	8,694	7,664
Fair value of plan assets	$ 6,254	$ 5,849

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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
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-Publisher FASB
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