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Benefit Plans - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Settlements   $ 47    
Pension Benefits        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Service cost $ 1 1 $ 2 $ 2
Interest cost 23 28 72 84
Expected return on plan assets (29) (32) (88) (96)
Amortization of unrecognized net loss 7 9 22 27
Settlements 4 47 4 48
Net periodic cost 6 53 12 65
Other Postretirement Benefits        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]        
Interest cost 1 1
Expected return on plan assets (1) (1) (2) (2)
Amortization of unrecognized net loss 1 1 1 1
Net periodic cost $ 0 $ 0 $ 0 $ 0