Pension and Postretirement Benefit Plans - Aggregate Funding Levels of Defined Benefit Pension Plans (Details) - Pension Plan [Member] - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
UNITED STATES
Plans with fair value of plan assets in excess of obligations:
Accumulated benefit obligation	$ 15	$ 14
Projected benefit obligation	15	14
Fair value of plan assets	16	15
Plans with obligations in excess of fair value of plan assets:
Accumulated benefit obligation	757	1,487
Projected benefit obligation	757	1,487
Fair value of plan assets	708	1,286
Foreign Plan [Member]
Plans with fair value of plan assets in excess of obligations:
Accumulated benefit obligation	17	15
Projected benefit obligation	17	16
Fair value of plan assets	21	19
Plans with obligations in excess of fair value of plan assets:
Accumulated benefit obligation	363	322
Projected benefit obligation	395	348
Fair value of plan assets	$ 57	$ 52

Defined Benefit Plan, Pension Plans with Plan Assets in Excess of Accumulated Benefit Obligations [Abstract]

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If aggregate disclosures are presented, the aggregate pension accumulated benefit obligation for pension plans with plan assets in excess of accumulated benefit obligations as of the measurement date of each statement of financial position presented.

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If aggregate disclosures are presented, the aggregate fair value of plan assets for pension plans with plan assets in excess of accumulated benefit obligations as of the measurement date of each statement of financial position presented.

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If aggregate disclosures are presented, the aggregate projected benefit obligation for pension plans with plan assets in excess of accumulated benefit obligations as of the measurement date of each statement of financial position presented.

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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
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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.

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