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Employee Benefit Plans (Net Periodic Defined Benefit Cost) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Defined Benefit Plan Disclosure [Line Items]    
Net periodic defined benefit credit $ (10) $ (12)
Qualified Plan    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 9 8
Interest cost 21 21
Expected return on plan assets (44) (45)
Amortization of prior service credit (4) (3)
Amortization of net loss 6 6
Total other components of net benefit credit (21) (21)
Net periodic defined benefit credit (12) (13)
Non-Qualified Plan    
Defined Benefit Plan Disclosure [Line Items]    
Service cost 1 1
Interest cost 2 2
Amortization of prior service credit (1) (2)
Amortization of net loss 1 1
Total other components of net benefit credit 2 1
Net periodic defined benefit credit 3 2
Postretirement Benefit Plan    
Defined Benefit Plan Disclosure [Line Items]    
Expected return on plan assets (1) (1)
Net periodic defined benefit credit $ (1) $ (1)