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Employee Benefits - Narrative (Details) $ in Millions | 9 Months Ended
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Sep. 30, 2019 USD ($)
Defined Benefit Plan Disclosure [Line Items] |
Pre-Medicare company contribution for retiree medical coverage, maximum percent | 4.00%
Contribution to other post retirement plans | $ 128
Pension Benefits |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan, contributions by employer to employee pension plan | 1,200
Pension Benefits | United States |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan, contributions by employer to employee pension plan | 1,070
Other Benefits |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan, expected contributions during the remaining of fiscal year | $ 47

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