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Pension and Postretirement Benefit Plans - Narrative (Details) - Funded - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Aug. 31, 2015 | Dec. 31, 2018 | Dec. 31, 2017
United States |  |  |
Benefit Plan Information |  |  |
Original percentage medical inflation indexation by company in year | 3.00% |  |
Revised percentage medical inflation indexation by company in year | 1.50% |  |
Qualified and Non-qualified Pension Benefits |  |  |
Benefit Plan Information |  |  |
Company contributions year to date |  | $ 366 | $ 964
Qualified and Non-qualified Pension Benefits | United States |  |  |
Benefit Plan Information |  |  |
Company contributions year to date |  | 254 | 852
Qualified and Non-qualified Pension Benefits | International |  |  |
Benefit Plan Information |  |  |
Company contributions year to date |  | 112 | 112
Postretirement Benefits |  |  |
Benefit Plan Information |  |  |
Company contributions year to date |  | $ 4 | $ 3

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- Definition The original percentage that the Company would credit the Retiree Medical Saving Account and the Medicare Health Reimbursement Arrangement as an inflation indexation. + References No definition available. + Details
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- Definition The revised percentage that the Company would credit the Retiree Medical Savings Account and the Medicare Health Reimbursement arrangement as an inflation indexation. + References No definition available. + Details
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