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Employee Benefit Plans - Components of Net Periodic Benefit Cost (Benefit) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 0 $ 0 $ 1 $ 1
Interest cost (44) (44) (131) (132)
Expected return on plan assets (61) (58) (182) (173)
Amortization of prior service credit 0 0 0 0
Amortization of actuarial loss (8) (9) (25) (26)
Net periodic cost (benefit) (9) (5) (25) (14)
Other Postretirement Benefits Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 0 0 0 0
Interest cost (1) (2) (4) (5)
Expected return on plan assets 0 (1) 0 (1)
Amortization of prior service credit (2) (2) (5) (5)
Amortization of actuarial loss (2) (2) (4) (4)
Net periodic cost (benefit) $ 1 $ 1 $ 3 $ 3