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Pension and Other Postretirement Benefits - Schedule of Changes in Net Loss and Prior Service Cost/(Credit) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Pension Plan      
Net loss / (gain)      
Balance at beginning of period $ 686 $ 712 $ 814
Reclassification to net periodic benefit cost (551) (46) (49)
Current year (gain) / loss (25) 22 (45)
Amendments 0 (1) 0
Foreign currency translation (1) (1) (8)
Balance at end of period 109 686 712
Prior service      
Balance at beginning of period (1) 0 2
Reclassification to net periodic benefit cost (1) (1) (1)
Current year (gain) / loss 0 0 (1)
Amendments 0 0 0
Foreign currency translation 0 0 0
Balance at end of period (2) (1) 0
Other Postretirement Benefits      
Net loss / (gain)      
Balance at beginning of period (3) (2) 21
Reclassification to net periodic benefit cost 0 0 (2)
Current year (gain) / loss (3) 0 (22)
Foreign currency translation 1 (1) 1
Balance at end of period (5) (3) (2)
Prior service      
Balance at beginning of period 0 0 (20)
Reclassification to net periodic benefit cost 0 0 20
Current year (gain) / loss 0 0 0
Foreign currency translation 0 0 0
Balance at end of period $ 0 $ 0 $ 0