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Employee Benefits (Details Textual)
$ in Millions
 6 Months Ended
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