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Accumulated Other Comprehensive Loss (Tables)
3 Months Ended
Mar. 31, 2022
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)    
Three months ended March 31, 2022     
Pensions and other postretirement liabilities$(356)$— $$(352)
Other comprehensive income (loss) of equity investees(46)—  (42)
Accumulated other comprehensive loss$(402)$$ $(394)
Three months ended March 31, 2021     
Pensions and other postretirement liabilities$(526)$— $$(518)
Other comprehensive loss of equity investees(68)— —  (68)
Accumulated other comprehensive loss$(594)$— $ $(586)