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Pension and Other Postretirement Benefit Plans - Net Benefit Costs (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Other Postretirement Benefit Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 11 $ 13 $ 37 $ 39
Interest cost 12 14 34 43
Expected return on plan assets (20) (19) (59) (56)
Amortization of unrecognized prior service credit (16) (18) (48) (54)
Net loss (gain) amortization (12) (5) (30) (13)
Termination benefits 0 0 37 0
Curtailments (1) 0 (29) (1)
Net periodic benefit cost (26) (15) (58) (42)
U.S. | Pension Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 104 96 302 270
Interest cost 102 107 305 323
Expected return on plan assets (188) (193) (568) (581)
Amortization of unrecognized prior service credit (9) (12) (29) (37)
Net loss (gain) amortization 75 75 218 228
Termination benefits 2 1 54 5
Curtailments (1) 1 15 4
Settlements 139 2 139 11
Net periodic benefit cost 224 77 436 223
International | Pension Plans        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 75 76 254 222
Interest cost 33 35 92 102
Expected return on plan assets (105) (104) (313) (309)
Amortization of unrecognized prior service credit (3) (3) (12) (9)
Net loss (gain) amortization 32 32 110 94
Termination benefits 0 1 3 2
Curtailments 0 0 (27) (1)
Settlements 0 0 2 2
Net periodic benefit cost $ 32 $ 37 $ 109 $ 103