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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2020
Equity [Abstract]  
Accumulated Other Comprehensive Loss
The components of “Other comprehensive income (loss)” reported in the Consolidated Statements of Comprehensive Income and 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 Year
 ($ in millions)    
Year ended December 31, 2020    
Pensions and other postretirement liabilities$(421)$(125)$20 $(526)
Other comprehensive income of equity investees(70)2 — (68)
Accumulated other comprehensive loss$(491)$(123)$20 $(594)
Year ended December 31, 2019    
Pensions and other postretirement liabilities$(497)$61 $15 $(421)
Other comprehensive loss of equity investees(66)(4)— (70)
Accumulated other comprehensive loss$(563)$57 $15 $(491)
Other Comprehensive Income (Loss) of Equity Investees
“Other comprehensive income (loss)” reported in the Consolidated Statements of Comprehensive Income consisted of the following:

Pretax
Amount		Tax
(Expense)
Benefit		Net-of-Tax
Amount
 ($ in millions)
Year ended December 31, 2020   
Net loss arising during the year:   
  Pensions and other postretirement benefits$(167)$42 $(125)
Reclassification adjustments for costs included in net income27 (7)20 
       Subtotal(140)35 (105)
Other comprehensive income of equity investees2 — 2 
Other comprehensive loss$(138)$35 $(103)
Year ended December 31, 2019   
Net gain arising during the year:   
  Pensions and other postretirement benefits$81 $(20)$61 
Reclassification adjustments for costs included in net income20 (5)15 
       Subtotal101 (25)76 
Other comprehensive loss of equity investees(4)— (4)
Other comprehensive income$97 $(25)$72 
Year ended December 31, 2018   
Net loss arising during the year:   
  Pensions and other postretirement benefits$(181)$45 $(136)
Reclassification adjustments for costs included in net income33 (8)25 
       Subtotal(148)37 (111)
Other comprehensive loss of equity investees(9)1 (8)
Other comprehensive loss$(157)$38 $(119)