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Pension and Other Postretirement Benefits (Schedule of Net Periodic Pension Cost) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Defined Benefit Plan Disclosure [Line Items]        
Service Cost $ 8 $ 9 $ 27 $ 31
Interest Cost 15 12 44 37
Expected Return on Plan Assets (35) (35) (105) (106)
Amortization of Actuarial Loss 9 13 25 40
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement 0 8 0 8
Net Periodic Pension Cost (Credit) (3) 7 $ (9) 10
Document Fiscal Year Focus     2022  
Pension Plan [Member] | Qualified Plans [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service Cost 7 9 $ 25 28
Interest Cost 14 12 42 36
Expected Return on Plan Assets (35) (35) (105) (106)
Amortization of Actuarial Loss 7 12 20 35
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement 0 0 0 0
Net Periodic Pension Cost (Credit) (7) (2) (18) (7)
Supplemental Employee Retirement Plan [Member] | Nonqualified Plans [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service Cost 1 0 2 3
Interest Cost 1 0 2 1
Expected Return on Plan Assets 0 0 0 0
Amortization of Actuarial Loss 2 1 5 5
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement 0 8 0 8
Net Periodic Pension Cost (Credit) $ 4 $ 9 $ 9 $ 17