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Accumulated Other Comprehensive Loss (Tables)
 3 Months Ended
Mar. 31, 2025
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Loss
The changes in the cumulative balances of “Accumulated other comprehensive loss” reported in the Consolidated Balance Sheets consisted of the following:
Balance at
Beginning
of Year		Net IncomeReclassification
Adjustments		Balance at
End of Period
 ($ in millions)
Three months ended March 31, 2025     
Pensions and other postretirement liabilities$(240)$— $— $(240)
Other comprehensive income of equity investees(22)1 —  (21)
Accumulated other comprehensive loss$(262)$1 $—  $(261)
Three months ended March 31, 2024     
Pensions and other postretirement liabilities$(292)$— $(2)$(294)
Other comprehensive loss of equity investees(28)— —  (28)
Accumulated other comprehensive loss$(320)$— $(2) $(322)