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Pension Benefit Plans and Other Postretirement Benefits - Changes in Plan Assets and Benefit Obligations Recognized in AOCI (Details) - Funded Plan - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Pension Benefit Plans | U.S.
Changes in plan assets and benefit obligations were recognized in accumulated other comprehensive income
Current year actuarial (gain) loss	$ 57	$ (6)
Amortization of actuarial loss	(56)	(41)
Settlement	(14)	(22)
Other adjustments		5
Total	(13)	(64)
Change in accumulated other comprehensive loss	(13)	(64)
Pension Benefit Plans | Non-U.S.
Changes in plan assets and benefit obligations were recognized in accumulated other comprehensive income
Current year actuarial (gain) loss	12	54
Amortization of actuarial loss	(12)	(10)
Settlement	(12)	(9)
Other adjustments	2	1
Total	(10)	36
Translation	12	8
Change in accumulated other comprehensive loss	2	44
Other Post-retirement Benefits | U.S.
Changes in plan assets and benefit obligations were recognized in accumulated other comprehensive income
Current year actuarial (gain) loss	14	3
Amortization of actuarial loss	(5)	(1)
Amortization of prior service credit	12	8
Other adjustments	(39)
Total	(18)	10
Other Post-retirement Benefits | Non-U.S.
Changes in plan assets and benefit obligations were recognized in accumulated other comprehensive income
Current year actuarial (gain) loss	5	(15)
Total	$ 5	$ (15)

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This element represents the total change in plan assets and obligations recognized in accumulated other comprehensive income net of tax and before translation.

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Represents the before tax amount of gain (loss) due to settlement in the benefit obligations, which was recognized in accumulated other comprehensive income (loss).

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Represents the before tax amount of other adjustments in the benefit obligations, which was recognized in accumulated other comprehensive income (loss).

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Amount before tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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Amount, before tax, of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) of defined benefit plan.

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Amount, before tax, after reclassification adjustment, of (increase) decrease in accumulated other comprehensive income for defined benefit plan.

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Amount, before tax, of gain (loss) for (increase) decrease in value of benefit obligation for change in actuarial assumptions and increase (decrease) in value of plan assets from experience different from that assumed of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit.

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Amount, before tax, of reclassification adjustment from accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan.

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