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CONSOLIDATED STATEMENT OF SHAREHOLDERS EQUITY (Parenthetical) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Statement of Stockholders' Equity [Abstract] |  |  |  |
Tax effect of gain (losses) on derivatives qualifying as hedges | $ 0 | $ 1 | $ 1 | $ 1
Tax effect of pension liability and postretirement adjustment | $ 0 | $ (1) | $ (1) | $ (3)
Cash dividends declared, per share | $ 0.79 | $ 0.77 | $ 2.33 | $ 2.27

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- Definition Amount, after reclassification, of tax expense (benefit) for gain (loss) from derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=124509347&loc=d3e640-108580 + Details
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