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Stockholders' Equity (Tables) | 12 Months Ended
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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 income | 27 |  |  | (7) |  |  | 20 |
Subtotal | (140) |  |  | 35 |  |  | (105) |
Other comprehensive income of equity investees | 2 |  |  | — |  |  | 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 income | 20 |  |  | (5) |  |  | 15 |
Subtotal | 101 |  |  | (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 income | 33 |  |  | (8) |  |  | 25 |
Subtotal | (148) |  |  | 37 |  |  | (111) |
Other comprehensive loss of equity investees | (9) |  |  | 1 |  |  | (8) |
Other comprehensive loss | $ | (157) |  |  | $ | 38 |  |  | $ | (119) |

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