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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Pension and other postretirement benefit plans obligations, tax | $ 6 | $ 8 | $ 3
Net unrealized losses on available for sale securities, tax | 3 | 3 | 0
Pacific Gas & Electric Co (Utility) |  |  |
Pension and other postretirement benefit plans obligations, tax | 5 | 2 | 1
Net unrealized losses on available for sale securities, tax | $ 4 | $ 3 | $ 0

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