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Employee Benefit Plans (Net Periodic Defined Benefit Cost) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Defined Benefit Plan Disclosure [Line Items]        
Net periodic defined benefit credit     $ (14) $ (45)
Qualified Plan        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 7 $ 10 15 19
Interest cost 22 15 43 31
Expected return on plan assets (42) (50) (83) (100)
Amortization of prior service credit (3) (3) (7) (7)
Amortization of net loss 8 5 16 10
Total other components of net benefit credit (15) (33) (31) (66)
Net periodic defined benefit credit (8) (23) (16) (47)
Non-Qualified Plan        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 0 0 1 1
Interest cost 2 2 4 3
Amortization of prior service credit (2) (3) (4) (5)
Amortization of net loss 1 2 2 4
Total other components of net benefit credit 1 1 2 2
Net periodic defined benefit credit 1 1 3 3
Postretirement Benefit Plan        
Defined Benefit Plan Disclosure [Line Items]        
Expected return on plan assets 0 (1) (1) (1)
Net periodic defined benefit credit $ 0 $ (1) $ (1) $ (1)