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Accumulated Other Comprehensive Loss (Tables)
9 Months Ended
Sep. 30, 2020
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 Income
(Loss)
Reclassification
Adjustments
Balance at
End of Period
 ($ in millions)    
Nine Months Ended September 30, 2020     
Pensions and other postretirement liabilities$(421)$— $14 $(407)
Other comprehensive income (loss) of equity
investees(70)—  (64)
Accumulated other comprehensive loss$(491)$$14  $(471)
Nine Months Ended September 30, 2019     
Pensions and other postretirement liabilities$(497)$— $11 $(486)
Other comprehensive loss of equity investees(66)(1)—  (67)
Accumulated other comprehensive loss$(563)$(1)$11  $(553)