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Employee Benefit Plans (Net Periodic Defined Benefit Cost) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Defined Benefit Plan Disclosure [Line Items]        
Net periodic defined benefit credit     $ (20) $ (68)
Qualified Plan        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 8 $ 9 23 28
Interest cost 21 16 64 47
Expected return on plan assets (41) (51) (124) (151)
Amortization of prior service credit (3) (4) (10) (11)
Amortization of net loss 8 4 24 14
Total other components of net benefit credit (15) (35) (46) (101)
Net periodic defined benefit credit (7) (26) (23) (73)
Non-Qualified Plan        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 1 1 2 2
Interest cost 2 1 6 4
Amortization of prior service credit (3) (2) (7) (7)
Amortization of net loss 1 3 3 7
Total other components of net benefit credit 0 2 2 4
Net periodic defined benefit credit 1 3 4 6
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)