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Consolidated Statements of Comprehensive Income (Unaudited) (Parenthetical) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Net deferred gains (losses) on derivatives-hedging activities, tax | $ 3 | $ (6) | $ 0 | $ (5)
Changes in unrealized net gains (losses) on investment securities, tax | (10) | 6 | (2) | 2
Changes in net unrecognized pension and other postretirement benefit costs, tax | (2) | 0 | 86 | 0
Net derivative (gains) losses-hedging activities, tax | (3) | (3) | (9) | (8)
Net realized (gains) losses on investment securities, tax | 1 | 0 | (1) | 0
Net pension and other postretirement benefit costs (credits), tax | 1 | 7 | (20) | 15
Net equity method investees, tax | 0 | (1) | 0 | (1)
Changes in other comprehensive income from equity method investees, tax | 0 | 0 | 0 | 0
Virginia Electric and Power Company |  |  |  |
Net deferred gains (losses) on derivatives-hedging activities, tax | 3 | (7) | 0 | (6)
Changes in unrealized net gains (losses) on investment securities, tax | (2) | 0 | (1) | 0
Net realized (gains) losses on investment securities, tax | $ (1) | $ 0 | $ (1) | $ 0

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- Definition Amount, before adjustment, of tax expense (benefit) for unrealized holding gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Excludes tax expense (benefit) for 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 -Name Accounting Standards Codification -Section 45 -Paragraph 12 -SubTopic 10 -Topic 220 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-12 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 10A -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-10A + Details
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