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Pension and Other Postretirement Benefits (Schedule of Net Periodic Pension Cost) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Defined Benefit Plan Disclosure [Line Items]        
Service Cost $ 10 $ 12 $ 19 $ 22
Interest Cost 14 12 29 25
Expected Return on Plan Assets (35) (36) (70) (71)
Amortization of Actuarial Loss 8 14 16 27
Net Periodic Pension Cost (Credit) (3) 2 $ (6) 3
Document Fiscal Year Focus     2022  
Pension Plan [Member] | Qualified Plans [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service Cost 9 10 $ 18 19
Interest Cost 14 12 28 24
Expected Return on Plan Assets (35) (36) (70) (71)
Amortization of Actuarial Loss 7 12 13 23
Net Periodic Pension Cost (Credit) (5) (2) (11) (5)
Supplemental Employee Retirement Plan [Member] | Nonqualified Plans [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service Cost 1 2 1 3
Interest Cost 0 0 1 1
Expected Return on Plan Assets 0 0 0 0
Amortization of Actuarial Loss 1 2 3 4
Net Periodic Pension Cost (Credit) $ 2 $ 4 $ 5 $ 8