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Accumulated Other Comprehensive Loss
 6 Months Ended
Jun. 30, 2023
Equity [Abstract]  
Accumulated Other Comprehensive Loss Accumulated Other Comprehensive LossThe 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, 2023     
Pensions and other postretirement liabilities$(319)$— $(8)$(327)
Other comprehensive loss of equity investees(32)— —  (32)
Accumulated other comprehensive loss$(351)$— $(8) $(359)
Six months ended June 30, 2022     
Pensions and other postretirement liabilities$(356)$— $8 $(348)
Other comprehensive income (loss) of equity investees(46)6 —  (40)
Accumulated other comprehensive loss$(402)$6 $8  $(388)