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Pension and Postretirement Plans (Summary of Components of Net Periodic Benefit Cost) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Other Benefits        
Components of Net Periodic Benefit Cost        
Service cost $ 2 $ 2 $ 3 $ 3
Interest cost 1 2 3 4
Expected return on plan assets 0 0 0 0
Amortization of prior service credit 0 (1) (1) (1)
Recognized net actuarial loss 0 0 0 0
Settlements 0 0 0 0
Net periodic benefit cost 3 3 5 6
U.S. | Pension Benefits        
Components of Net Periodic Benefit Cost        
Service cost 34 31 67 63
Interest cost 24 27 49 54
Expected return on plan assets (42) (35) (83) (71)
Amortization of prior service credit 0 0 0 0
Recognized net actuarial loss 15 13 29 26
Settlements 39 2 39 6
Net periodic benefit cost 70 38 101 78
Int’l. | Pension Benefits        
Components of Net Periodic Benefit Cost        
Service cost 7 6 14 12
Interest cost 5 7 11 13
Expected return on plan assets (12) (12) (25) (23)
Amortization of prior service credit 0 0 0 0
Recognized net actuarial loss 4 1 8 3
Settlements 0 0 0 0
Net periodic benefit cost $ 4 $ 2 $ 8 $ 5