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Employee Benefit Plans - Components of Net Periodic Benefit Cost (Benefit) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 1 $ 1 $ 1 $ 1
Interest cost (43) (44) (87) (88)
Expected return on plan assets (61) (58) (121) (115)
Amortization of prior service credit 0 0 0 0
Amortization of actuarial loss (9) (9) (17) (17)
Net periodic cost (benefit) (8) (4) (16) (9)
Other Postretirement Benefits Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 0 0 0 0
Interest cost (1) (1) (3) (3)
Expected return on plan assets 0 0 0 0
Amortization of prior service credit (1) (1) (3) (3)
Amortization of actuarial loss (1) (1) (2) (2)
Net periodic cost (benefit) $ 1 $ 1 $ 2 $ 2