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Consolidated Statements of Income and Comprehensive Income (Parenthetical) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Income Statement [Abstract] |  |  |  |
Change in net unrealized gain (loss) on securities available for sale, tax | $ 9 | $ 0 | $ 34 | $ (16)
Change in pension and post-retirement obligations, tax | 0 | 0 | (1) | 0
Cash flow hedge, gain (loss), reclassification, tax | 0 | 1 | 0 | 16
Reclassification adjustment for sales of available-for-sale securities, tax | 0 | 0 | 0 | 0
Reclassification adjustment for defined benefit pension plan, net of tax | 0 | 0 | (1) | (1)
Cash flow hedges tax component | $ (2) | $ (1) | $ (4) | $ (2)

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- Definition Amount, before adjustment, of tax expense (benefit) for unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) and unrealized gain (loss) on investment in debt security measured at amortized cost (held-to-maturity) from transfer to available-for-sale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e640-108580 + Details
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