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Retirement Plans and Other Retiree Benefits - Key Assumptions (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Other Retiree Benefit Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Effect of one percentage point increase on accumulated postretirement benefit obligation | $ 123 |  |
Effect of one percentage point increase on service and interest cost | 9 |  |
Effect of one percentage point decrease on accumulated postretirement benefit obligation | (100) |  |
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% | 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% | 1.00%

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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. + Details
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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (m) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (m) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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