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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, 2023
Dec. 31, 2022
Dec. 31, 2021
Pension Plan      
Net loss      
Balance at beginning of period $ 712 $ 814 $ 1,802
Reclassification to net periodic benefit cost (46) (49) (1,629)
Current year loss / (gain) 22 (45) 640
Amendments (1) 0 (1)
Foreign currency translation (1) (8) 2
Balance at end of period 686 712 814
Prior service      
Balance at beginning of period 0 2 8
Reclassification to net periodic benefit cost (1) (1) (4)
Current year loss / (gain) 0 (1) (2)
Amendments 0 0 0
Foreign currency translation 0 0 0
Balance at end of period (1) 0 2
Other Postretirement Benefits      
Net loss      
Balance at beginning of period (2) 21 45
Reclassification to net periodic benefit cost 0 (2) (4)
Current year loss / (gain) 0 (22) (20)
Foreign currency translation (1) 1 0
Balance at end of period (3) (2) 21
Prior service      
Balance at beginning of period 0 (20) (46)
Reclassification to net periodic benefit cost 0 20 26
Current year loss / (gain) 0 0 0
Foreign currency translation 0 0 0
Balance at end of period $ 0 $ 0 $ (20)