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Employee Benefits - Narrative (Details)
$ in Millions
 3 Months Ended
Mar. 31, 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 $ 47
Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
Defined benefit plan, contributions by employer to employee pension plan 326
Defined benefit plan, estimated future employer contributions in next fiscal year beginning after the date of the latest statement of financial position 1,300
Pension Benefits | United States  
Defined Benefit Plan Disclosure [Line Items]  
Defined benefit plan, contributions by employer to employee pension plan 288
Defined benefit plan, estimated future employer contributions in next fiscal year beginning after the date of the latest statement of financial position 1,100
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 200
Other Benefits  
Defined Benefit Plan Disclosure [Line Items]  
Defined benefit plan, expected contributions during the remaining of fiscal year $ 128