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Accumulated Other Comprehensive Loss (Tables) | 3 Months Ended
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Mar. 31, 2021
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 |  | Reclassification Adjustments |  | Balance at End of Period
| ($ in millions)
Three Months Ended March 31, 2021 |  |  |  |  |  |  |
Pensions and other postretirement liabilities | $ | (526) |  |  | $ | — |  |  | $ | 8 |  |  | $ | (518) |
Other comprehensive income (loss) of equity investees | (68) |  |  | — |  |  | — |  |  | (68) |
Accumulated other comprehensive loss | $ | (594) |  |  | $ | — |  |  | $ | 8 |  |  | $ | (586) |
Three Months Ended March 31, 2020 |  |  |  |  |  |  |
Pensions and other postretirement liabilities | $ | (421) |  |  | $ | — |  |  | $ | 5 |  |  | $ | (416) |
Other comprehensive income (loss) of equity investees | (70) |  |  | 5 |  |  | — |  |  | (65) |
Accumulated other comprehensive loss | $ | (491) |  |  | $ | 5 |  |  | $ | 5 |  |  | $ | (481) |

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 + Details
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