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Accumulated Other Comprehensive Loss (Tables)
9 Months Ended
Sep. 30, 2023
Equity [Abstract]  
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)
Nine months ended September 30, 2023     
Pensions and other postretirement liabilities$(319)$— $(13)$(332)
Other comprehensive loss of equity investees(32)— —  (32)
Accumulated other comprehensive loss$(351)$— $(13) $(364)
Nine months ended September 30, 2022     
Pensions and other postretirement liabilities$(356)$— $14 $(342)
Other comprehensive income (loss) of equity investees(46)11 —  (35)
Accumulated other comprehensive loss$(402)$11 $14  $(377)