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Post-Employment Benefits - (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Defined Benefit Plans        
Defined benefit plan net periodic benefit cost        
Service cost - benefits earned during the period $ 96 $ 81 $ 196 $ 166
Interest cost on projected benefit obligations 62 74 124 149
Expected return on plan assets (211) (191) (422) (383)
Net amortization of:        
Actuarial loss, net 78 64 159 127
Prior service cost (credit) 1 1 1 1
Net cost - continuing operations 26 29 58 60
Post-employment Obligations and Other Long-term Liabilities:        
Company contributions     80 335
Medical and Dental Plans        
Defined benefit plan net periodic benefit cost        
Service cost - benefits earned during the period 14 11 28 23
Interest cost on projected benefit obligations 9 9 17 21
Expected return on plan assets (7) (7) (14) (14)
Net amortization of:        
Actuarial loss, net 7 2 14 10
Prior service cost (credit) (7) (7) (14) (14)
Net cost - continuing operations $ 16 $ 8 31 26
Post-employment Obligations and Other Long-term Liabilities:        
Company contributions     $ 0 $ 11