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Employee Benefits - Additional Information (Details)
$ in Millions
 9 Months Ended
Sep. 30, 2021
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
Pre-Medicare company contribution for retiree medical coverage, maximum percent 4.00%
Defined benefit plan, expected contributions during the remaining of fiscal year $ 1,750
Contribution to other post retirement plans 107
Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
Defined benefit plan, contributions by employer to employee pension plan 1,400
Pension Benefits | United States  
Defined Benefit Plan Disclosure [Line Items]  
Defined benefit plan, contributions by employer to employee pension plan 1,300
Defined benefit plan, expected contributions during the remaining of fiscal year 1,550
Pension Benefits | International  
Defined Benefit Plan Disclosure [Line Items]  
Defined benefit plan, expected contributions during the remaining of fiscal year 200
Other Benefits  
Defined Benefit Plan Disclosure [Line Items]  
Defined benefit plan, expected contributions during the remaining of fiscal year $ 47