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Employee Benefit Plans (Net Periodic Defined Benefit Cost) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Defined Benefit Plan Disclosure [Line Items]        
Net periodic defined benefit credit     $ (24) $ (14)
Qualified Plan        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 9 $ 7 17 15
Interest cost 21 22 42 43
Expected return on plan assets (45) (42) (90) (83)
Amortization of prior service credit (4) (3) (7) (7)
Amortization of net loss 5 8 11 16
Total other components of net benefit credit (23) (15) (44) (31)
Net periodic defined benefit credit (14) (8) (27) (16)
Non-Qualified Plan        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 0 0 1 1
Interest cost 2 2 4 4
Amortization of prior service credit (1) (2) (3) (4)
Amortization of net loss 1 1 2 2
Total other components of net benefit credit 2 1 3 2
Net periodic defined benefit credit 2 1 4 3
Postretirement Benefit Plan        
Defined Benefit Plan Disclosure [Line Items]        
Expected return on plan assets 0 0 (1) (1)
Net periodic defined benefit credit $ 0 $ 0 $ (1) $ (1)