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Pension and Postretirement Benefit Plans - Components of net periodic benefit cost and other information (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Non-operating expense    
Total net periodic benefit cost (benefit) $ (67) $ (79)
Postretirement Benefits    
Operating expense    
Service cost 11 12
Non-operating expense    
Interest cost 13 11
Expected return on plan assets (18) (19)
Amortization of transition asset 0 0
Amortization of prior service benefit (7) (8)
Amortization of net actuarial loss 10 14
Settlements, curtailments, special termination benefits and other 1 1
Total non-operating expense (benefit) (1) (1)
Total net periodic benefit cost (benefit) 10 11
UNITED STATES | Qualified and Non-qualified Pension Benefits    
Operating expense    
Service cost 64 72
Non-operating expense    
Interest cost 104 90
Expected return on plan assets (241) (264)
Amortization of transition asset 0 0
Amortization of prior service benefit (6) (6)
Amortization of net actuarial loss 106 132
Settlements, curtailments, special termination benefits and other 0 0
Total non-operating expense (benefit) (37) (48)
Total net periodic benefit cost (benefit) 27 24
International | Qualified and Non-qualified Pension Benefits    
Operating expense    
Service cost 35 42
Non-operating expense    
Interest cost 32 25
Expected return on plan assets (72) (81)
Amortization of transition asset 0 0
Amortization of prior service benefit 0 (1)
Amortization of net actuarial loss 11 27
Settlements, curtailments, special termination benefits and other 0 0
Total non-operating expense (benefit) (29) (30)
Total net periodic benefit cost (benefit) $ 6 $ 12