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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, 2023
Dec. 31, 2022
Plan Assets    
Balance at beginning of period $ 252 $ 218
Foreign currency translation 2 (9)
Asset returns – assets held at reporting date (6) (11)
Asset returns – assets sold during the period (7) 10
Purchases, sales and settlements, net (7) 44
Balance at end of period 234 252
Private equity    
Plan Assets    
Balance at beginning of period 5 7
Foreign currency translation 0 0
Asset returns – assets held at reporting date 18 (2)
Asset returns – assets sold during the period (18) 1
Purchases, sales and settlements, net (2) (1)
Balance at end of period 3 5
Real estate    
Plan Assets    
Balance at beginning of period 247 211
Foreign currency translation 2 (9)
Asset returns – assets held at reporting date (24) (9)
Asset returns – assets sold during the period 11 9
Purchases, sales and settlements, net (5) 45
Balance at end of period $ 231 $ 247