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Employee Benefit Plans (Net Periodic Defined Benefit 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]        
Net periodic defined benefit credit     $ (45) $ (41)
Qualified Plan        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 10 $ 9 19 19
Interest Cost 15 15 31 30
Expected return on plan assets (50) (51) (100) (101)
Amortization of prior service credit (3) (4) (7) (9)
Amortization of net loss 5 8 10 15
Total other components of net benefit credit (33) (32) (66) (65)
Net periodic defined benefit credit (23) (23) (47) (46)
Non-Qualified Plan        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 0 1 1 1
Interest Cost 2 1 3 3
Amortization of prior service credit (3) (2) (5) (3)
Amortization of net loss 2 2 4 5
Total other components of net benefit credit 1 1 2 5
Net periodic defined benefit credit 1 2 3 6
Postretirement Benefit Plan        
Defined Benefit Plan Disclosure [Line Items]        
Expected return on plan assets (1) 0 (1) (1)
Net periodic defined benefit credit $ (1) $ 0 $ (1) $ (1)