Retirement Plans and Other Retiree Benefits - Key Assumptions (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Other Retiree Benefit Plans
Defined Benefit Plan Disclosure [Line Items]
Effect of one percentage point increase on accumulated postretirement benefit obligation	$ 115
Effect of one percentage point increase on service and interest cost	10
Effect of one percentage point decrease on accumulated postretirement benefit obligation	(93)
Effect of one percentage point decrease on service and interest cost	$ (7)
Other post-retirement plan, benefit obligation, percent decrease due to expected mortality update in the current year		2.00%
United States \| Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, benefit obligation, percent decrease due to expected mortality update in current year		1.00%

Defined Benefit Plan, Benefit Obligation, Percentage Decrease Due To Expected Mortality Update In The Current Year

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- Definition

Other Post-Retirement Plan, Benefit Obligation, Percentage Decrease Due To Expected Mortality Update In The Current Year

+ References

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Amount of decrease in accumulated postretirement benefit obligation from one-percentage-point decrease in assumed health care cost trend rate.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (m)
-URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920

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- Definition

Amount of decrease in service and interest cost components of net periodic postretirement benefit cost from one-percentage-point decrease in assumed health care cost trend rate.

+ References

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- Definition

Amount of increase in accumulated postretirement benefit obligation from one-percentage-point increase in assumed health care cost trend rate.

+ References

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- Definition

Amount of increase in service and interest cost components of net periodic postretirement benefit cost from one-percentage-point increase in assumed health care cost trend rate.

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