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Employee Benefit Plans (Net Periodic Defined Benefit Cost) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Defined Benefit Plan Disclosure [Line Items]        
Net periodic defined benefit credit     $ (36) $ (20)
Qualified Plan        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 8 $ 8 25 23
Interest cost 20 21 62 64
Expected return on plan assets (44) (41) (134) (124)
Amortization of prior service credit (4) (3) (11) (10)
Amortization of net loss 6 8 17 24
Total other components of net benefit credit (22) (15) (66) (46)
Net periodic defined benefit credit (14) (7) (41) (23)
Non-Qualified Plan        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 1 1 2 2
Interest cost 2 2 6 6
Amortization of prior service credit (2) (3) (5) (7)
Amortization of net loss 1 1 3 3
Total other components of net benefit credit 1 0 4 2
Net periodic defined benefit credit 2 1 6 4
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)