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Employee Benefit Plans (Net Periodic Defined Benefit 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]        
Net periodic defined benefit credit     $ (68) $ (61)
Qualified Plan        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 9 $ 10 28 29
Interest Cost 16 16 47 46
Expected return on plan assets (51) (51) (151) (152)
Amortization of prior service credit (4) (5) (11) (14)
Amortization of net loss 4 7 14 22
Total other components of net benefit credit (35) (33) (101) (98)
Net periodic defined benefit credit (26) (23) (73) (69)
Non-Qualified Plan        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 1 0 2 1
Interest Cost 1 2 4 5
Amortization of prior service credit (2) (2) (7) (5)
Amortization of net loss 3 3 7 8
Total other components of net benefit credit 2 3 4 8
Net periodic defined benefit credit 3 3 6 9
Postretirement Benefit Plan        
Defined Benefit Plan Disclosure [Line Items]        
Interest Cost 1 1 1 1
Expected return on plan assets (1) (1) (2) (2)
Net periodic defined benefit credit $ 0 $ 0 $ (1) $ (1)