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Accumulated Other Comprehensive Loss | 6 Months Ended
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Jun. 30, 2021
Equity [Abstract] |
Accumulated Other Comprehensive Loss | Accumulated Other Comprehensive LossThe 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)
Six months ended June 30, 2021 |  |  |  |  |  |  |
Pensions and other postretirement liabilities | $ | (526) |  |  | $ | — |  |  | $ | 16 |  |  | $ | (510) |
Other comprehensive income (loss) of equity investees | (68) |  |  | — |  |  | — |  |  | (68) |
Accumulated other comprehensive loss | $ | (594) |  |  | $ | — |  |  | $ | 16 |  |  | $ | (578) |
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) |

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- Definition The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -URI http://asc.fasb.org/topic&trid=2134417 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 + Details
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