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Retirement Plans (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Net Periodic Pension And OPEB Cost [Abstract]          
Changes in fair value       5 years  
Defined Benefit Plan, Accumulated Benefit Obligation, Increase (Decrease) for Plan Amendment $ (92,000,000)   $ (92,000,000)   $ (92,000,000)
Other comprehensive income defined benefit plans 69,000,000 $ (18,000,000) (82,000,000) $ (40,000,000) (92,000,000)
Deferred Tax Assets, Gross $ 23,000,000   23,000,000   23,000,000
Future net peroidic OPEB cost amortization duration 8 years        
Defined Benefit Plans [Member]          
Net Periodic Pension And OPEB Cost [Abstract]          
Service cost   26,000,000 22,000,000 53,000,000 44,000,000
Interest cost   35,000,000 40,000,000 69,000,000 80,000,000
Expected return on plan assets   (70,000,000) (68,000,000) (140,000,000) (136,000,000)
Amortization of actuarial loss   24,000,000 16,000,000 52,000,000 32,000,000
Net periodic cost   15,000,000 10,000,000 34,000,000 20,000,000
Voluntary cash contributions to qualified pension plan       0  
OPEB [Member]          
Net Periodic Pension And OPEB Cost [Abstract]          
Service cost   1,000,000 1,000,000 1,000,000 1,000,000
Interest cost   2,000,000 2,000,000 3,000,000 5,000,000
Amortization of prior service cost   (4,000,000)   (7,000,000)  
Amortization of actuarial loss   2,000,000 2,000,000 4,000,000 3,000,000
Net periodic cost   $ 1,000,000 $ 5,000,000 $ 1,000,000 $ 9,000,000