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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, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Pension Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost $ 0 $ 1 $ 1 $ 3
Interest cost (44) (45) (132) (135)
Expected return on plan assets (58) (58) (173) (176)
Amortization of prior service credit 0 0 0 0
Amortization of actuarial loss (9) (7) (26) (21)
Net periodic cost (benefit) (5) (5) (14) (17)
Other Postretirement Benefits Plan [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Service cost 0 0 0 0
Interest cost (2) (1) (5) (5)
Expected return on plan assets (1) 0 (1) (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