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Retirement Plans (Details) - USD ($)
 3 Months Ended 9 Months Ended
Jun. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 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)
Other comprehensive income defined benefit plans 69,000,000 $ (18,000,000) $ (11,000,000) $ (58,000,000) (103,000,000)
Deferred Tax Assets, Gross $ 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   19,000,000 23,000,000 72,000,000 67,000,000
Interest cost   33,000,000 40,000,000 102,000,000 120,000,000
Expected return on plan assets   (71,000,000) (68,000,000) (211,000,000) (204,000,000)
Amortization of actuarial loss   27,000,000 16,000,000 79,000,000 48,000,000
Net periodic cost   8,000,000 11,000,000 42,000,000 31,000,000
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
Interest cost   1,000,000 3,000,000 4,000,000 8,000,000
Amortization of prior service cost   (3,000,000) (4,000,000) (10,000,000) (4,000,000)
Amortization of actuarial loss   1,000,000 $ 1,000,000 $ 5,000,000 4,000,000
Net periodic cost   $ (1,000,000)     $ 9,000,000