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Condensed Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Available-for-sale securities: |  |  |  |
Tax impact on net unrealized gains (losses) | $ 0 | $ 1 | $ 0 | $ 4
Tax impact of reclassifications to net income | 0 | 0 | 0 | (8)
Cash flow hedges: |  |  |  |
Tax impact on net unrealized gains | 0 | (2) | 1 | (11)
Tax impact of reclassifications to net income | $ 0 | $ 1 | $ 0 | $ 0

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- Definition Amount, before 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=114867106&loc=d3e640-108580 + Details
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