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Accumulated Other Comprehensive Loss (Tables)
 6 Months Ended
Jun. 30, 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)
Six months ended June 30, 2025     
Pensions and other postretirement liabilities$(240)$— $— $(240)
Other comprehensive income (loss) of equity investees(22)1 —  (21)
Accumulated other comprehensive loss$(262)$1 $—  $(261)
Six months ended June 30, 2024     
Pensions and other postretirement liabilities$(292)$(7)$(4)$(303)
Other comprehensive income (loss) of equity investees(28)1 —  (27)
Accumulated other comprehensive loss$(320)$(6)$(4) $(330)