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Accumulated Other Comprehensive Loss
6 Months Ended
Jun. 30, 2022
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, 2022     
Pensions and other postretirement liabilities$(356)$— $$(348)
Other comprehensive income (loss) of equity investees(46)—  (40)
Accumulated other comprehensive loss$(402)$$ $(388)
Six months ended June 30, 2021     
Pensions and other postretirement liabilities$(526)$— $16 $(510)
Other comprehensive loss of equity investees(68)— —  (68)
Accumulated other comprehensive loss$(594)$— $16  $(578)