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Employee Benefits (Details Textual) $ in Millions | 6 Months Ended
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Jun. 30, 2018 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 | $ 85
Pension Benefits |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan, contributions by employer to employee pension plan | 531
Defined benefit plan, estimated future employer contributions in next fiscal year beginning after the date of the latest statement of financial position | 1,050
Pension Benefits | United States |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan, contributions by employer to employee pension plan | 448
Defined benefit plan, estimated future employer contributions in next fiscal year beginning after the date of the latest statement of financial position | 800
Pension Benefits | International |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan, estimated future employer contributions in next fiscal year beginning after the date of the latest statement of financial position | 250
Other Benefits |
Defined Benefit Plan Disclosure [Line Items] |
Defined benefit plan, expected contributions during the remaining of fiscal year | $ 89

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