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Pension and Other Postretirement Benefits - Schedule of Reconciliation of Plan Assets Measured by Significant Unobservable Inputs (Details) - Level 3 - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Plan Assets    
Balance at beginning of period $ 234 $ 252
Foreign currency translation (4) 2
Asset returns – assets held at reporting date (3) (6)
Asset returns – assets sold during the period (2) (7)
Purchases, sales and settlements, net (53) (7)
Balance at end of period 172 234
Private equity    
Plan Assets    
Balance at beginning of period 3 5
Foreign currency translation 0 0
Asset returns – assets held at reporting date 3 18
Asset returns – assets sold during the period (4) (18)
Purchases, sales and settlements, net 0 (2)
Balance at end of period 2 3
Real estate    
Plan Assets    
Balance at beginning of period 231 247
Foreign currency translation (4) 2
Asset returns – assets held at reporting date (6) (24)
Asset returns – assets sold during the period 2 11
Purchases, sales and settlements, net (53) (5)
Balance at end of period $ 170 $ 231