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Accumulated Other Comprehensive Loss
 6 Months Ended
Jun. 30, 2020
Equity [Abstract]  
Accumulated Other Comprehensive Loss 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)    
Six Months Ended June 30, 2020     
Pensions and other postretirement liabilities$(421) $—  $10  $(411) 
Other comprehensive income (loss)     
of equity investees(70) 6  —   (64) 
Accumulated other comprehensive loss$(491) $6  $10   $(475) 
Six Months Ended June 30, 2019     
Pensions and other postretirement liabilities$(497) $—  $7  $(490) 
Other comprehensive loss
of equity investees(66) (1) —   (67) 
Accumulated other comprehensive loss$(563) $(1) $7   $(557)