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EQUITY (Narrative) (Details) - USD ($) | Sep. 30, 2021 | Jul. 09, 2021 | Oct. 27, 2021 | Jul. 08, 2021 | Apr. 30, 2021 | Dec. 31, 2020 | Apr. 09, 2020
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Schedule Of Changes In Equity [Line Items] |  |  |  |  |  |  |
Common stock, shares outstanding (in shares) | 1,985,369,201 |  |  |  |  | 1,984,678,673 |
Non-GAAP core earnings requirement to pay common dividends |  |  |  |  |  |  | $ 6,200,000,000
PG&E Corporation |  |  |  |  |  |  |
Schedule Of Changes In Equity [Line Items] |  |  |  |  |  |  |
Increase in common stock |  | $ 4,850,000,000 |  |  |  |  |
PG&E Corporation | Subsequent event |  |  |  |  |  |  |
Schedule Of Changes In Equity [Line Items] |  |  |  |  |  |  |
Common stock, shares outstanding, adjusted (in shares) |  |  | 1,507,625,611 |  |  |  |
PG&E Corporation | Common Stock | Fire Victim Trust Share Exchange and Tax Matters Agreement |  |  |  |  |  |  |
Schedule Of Changes In Equity [Line Items] |  |  |  |  |  |  |
Transfer of shares to Fire Victim Trust (in shares) | 477,743,590 |  |  |  |  |  |
Stock issued during period, shares, new issues (in shares) |  | 477,743,590 |  |  |  |  |
PG&E Corporation | Common Stock | At The Market Equity Distribution Program |  |  |  |  |  |  |
Schedule Of Changes In Equity [Line Items] |  |  |  |  |  |  |
Sale of stock, number of shares issued in transaction, amount | $ 400,000,000 |  |  |  | $ 400,000,000 |  |
PG&E Corporation | Minimum |  |  |  |  |  |  |
Schedule Of Changes In Equity [Line Items] |  |  |  |  |  |  |
Percentage of equity security ownership with board of director approval | 4.75% |  |  | 4.75% |  |  |
PG&E Corporation | Minimum | Subsequent event |  |  |  |  |  |  |
Schedule Of Changes In Equity [Line Items] |  |  |  |  |  |  |
Percentage of equity security ownership with board of director approval |  |  | 2.90% |  |  |  |
PG&E Corporation | Maximum | Fire Victim Trust Share Exchange and Tax Matters Agreement |  |  |  |  |  |  |
Schedule Of Changes In Equity [Line Items] |  |  |  |  |  |  |
Common stock, shares authorized, reserve, additional shares due to nonconforming new shares (in shares) | 250,000,000 |  |  |  |  |  |

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