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Pension and Other Postretirement Benefit Programs - Net Periodic Benefit Cost Relating to Pension and Other Postemployment Employee Benefit Plans (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Pension benefits        
Net periodic benefit cost        
Service cost $ 20 $ 20 $ 41 $ 38
Interest cost 23 43 47 90
Expected return on plan assets (40) (68) (81) (140)
Amortization of net losses and prior service costs 19 14 38 29
Net periodic cost 22 9 45 17
OPEB        
Net periodic benefit cost        
Interest cost 1 2 2 4
Amortization of net losses and prior service costs (4) (7) (8) (14)
Net periodic cost $ (3) $ (5) $ (6) $ (10)