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DEBT (Narrative) (Details) - USD ($) | Apr. 30, 2018 | Mar. 31, 2018 | Feb. 28, 2018 | Feb. 18, 2018 | Jan. 31, 2018 | Feb. 28, 2017
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Senior Notes Two Point Four Zero Percent Due 2019 |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |
Senior notes |  | $ 350,000,000 |  |  |  |
Debt instrument, interest rate |  | 2.40% |  |  |  |
Pacific Gas & Electric Co |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |
Floating rate unsecured term loan, matured 2018 |  |  |  |  |  | $ 250,000,000
Pacific Gas & Electric Co | Pollution Control Bonds Series 1996 C, E, F, And 1997 B |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |
Debt instrument, face amount |  | $ 614,000,000 |  |  |  |
Pacific Gas & Electric Co | Pollution Control Bonds Series 1996 C, E, F, And 1997 B | Minimum |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |
Debt instrument, interest rate |  | 1.52% |  |  |  |
Pacific Gas & Electric Co | Pollution Control Bonds Series 1996 C, E, F, And 1997 B | Maximum |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |
Debt instrument, interest rate |  | 1.65% |  |  |  |
Pacific Gas & Electric Co | Pollution Control Bonds Series 2009 A-B |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |
Debt instrument, face amount |  | $ 149,000,000 |  |  |  |
Pacific Gas & Electric Co | Pollution Control Bonds Series 2009 A-B | Maximum |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |
Debt instrument, interest rate |  | 1.60% |  |  |  |
Pacific Gas & Electric Co | Senior Notes Eight Point Two Five Percent Due 2018 |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |
Senior notes |  |  |  | $ 400,000,000 | $ 400,000,000 |
Debt instrument, interest rate |  |  |  |  | 8.25% |
Subsequent Event | Floating Rate Unsecured Term Loan, Due 2020 | Unsecured Debt |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |
Debt instrument, face amount | $ 350,000,000 |  |  |  |  |
Unsecured Debt | Pacific Gas & Electric Co | Floating Rate Unsecured Term Loan, Due 2019 |  |  |  |  |  |
Debt [Line Items] |  |  |  |  |  |
Debt instrument, face amount |  |  | $ 250,000,000 |  |  |

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