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REGULATORY ENVIRONMENT - WI 2020 AND 2021 RATES - AUGUST SETTLEMENTS (Details) - Public Service Commission of Wisconsin (PSCW) $ in Millions | 1 Months Ended
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Aug. 31, 2019 USD ($) utility | Mar. 31, 2019 USD ($)
August 2019 Settlement Agreement | Electric rates | Tax Cuts and Jobs Act of 2017 |  |
Public Utilities, General Disclosures [Line Items] |  |
Amortization period | 2 years |
August 2019 Settlement Agreement | Natural gas rates | Tax Cuts and Jobs Act of 2017 |  |
Public Utilities, General Disclosures [Line Items] |  |
Amortization period | 4 years |
Number of gas utilities amortizing unprotected deferred tax expense over 4 years | utility | 3 |
August 2019 Settlement Agreement | WE | 2020 and 2021 rates |  |
Public Utilities, General Disclosures [Line Items] |  |
Requested return on equity (as a percent) | 10.00% |
Requested common equity component average (as a percent) | 52.50% |
August 2019 Settlement Agreement | WE | Electric rates |  |
Public Utilities, General Disclosures [Line Items] |  |
Pleasant Prairie power plant's book value to be securitized | $ 100 |
August 2019 Settlement Agreement | WE | Electric rates | 2020 rates |  |
Public Utilities, General Disclosures [Line Items] |  |
Requested rate increase | $ 37 |
Requested rate increase (as a percent) | 1.30% |
August 2019 Settlement Agreement | WE | Electric rates | 2020 rates | Tax Cuts and Jobs Act of 2017 |  |
Public Utilities, General Disclosures [Line Items] |  |
Amortization of regulatory liabilities | $ 65 |
August 2019 Settlement Agreement | WE | Electric rates | 2021 rates | Tax Cuts and Jobs Act of 2017 |  |
Public Utilities, General Disclosures [Line Items] |  |
Amortization of regulatory liabilities | 65 |
August 2019 Settlement Agreement | WE | Natural gas rates | 2020 rates |  |
Public Utilities, General Disclosures [Line Items] |  |
Requested rate increase | $ 10 |
Requested rate increase (as a percent) | 2.80% |
August 2019 Settlement Agreement | WE | Natural gas rates | 2020 rates | Tax Cuts and Jobs Act of 2017 |  |
Public Utilities, General Disclosures [Line Items] |  |
Amortization of regulatory liabilities | $ (5) |
August 2019 Settlement Agreement | WE | Natural gas rates | 2021 rates | Tax Cuts and Jobs Act of 2017 |  |
Public Utilities, General Disclosures [Line Items] |  |
Amortization of regulatory liabilities | (5) |
August 2019 Settlement Agreement | WE | Steam rates | 2020 rates |  |
Public Utilities, General Disclosures [Line Items] |  |
Requested rate increase | $ 2 |
Requested rate increase (as a percent) | 10.00% |
August 2019 Settlement Agreement | WG | 2020 and 2021 rates |  |
Public Utilities, General Disclosures [Line Items] |  |
Requested return on equity (as a percent) | 10.20% |
Requested common equity component average (as a percent) | 52.50% |
August 2019 Settlement Agreement | WG | Natural gas rates | 2020 rates |  |
Public Utilities, General Disclosures [Line Items] |  |
Requested rate increase | $ (1) |
Requested rate increase (as a percent) | (0.20%) |
August 2019 Settlement Agreement | WG | Natural gas rates | 2020 rates | Tax Cuts and Jobs Act of 2017 |  |
Public Utilities, General Disclosures [Line Items] |  |
Amortization of regulatory liabilities | $ 3 |
August 2019 Settlement Agreement | WG | Natural gas rates | 2021 rates | Tax Cuts and Jobs Act of 2017 |  |
Public Utilities, General Disclosures [Line Items] |  |
Amortization of regulatory liabilities | $ 3 |
August 2019 Settlement Agreement | WPS | 2020 and 2021 rates |  |
Public Utilities, General Disclosures [Line Items] |  |
Requested return on equity (as a percent) | 10.00% |
Requested common equity component average (as a percent) | 52.50% |
August 2019 Settlement Agreement | WPS | Electric rates | Earnings sharing mechanisms |  |
Public Utilities, General Disclosures [Line Items] |  |
Amortization period | 2 years |
August 2019 Settlement Agreement | WPS | Electric rates | 2020 rates |  |
Public Utilities, General Disclosures [Line Items] |  |
Requested rate increase | $ 35 |
Requested rate increase (as a percent) | 3.50% |
August 2019 Settlement Agreement | WPS | Electric rates | 2020 rates | Tax Cuts and Jobs Act of 2017 |  |
Public Utilities, General Disclosures [Line Items] |  |
Amortization of regulatory liabilities | $ 11 |
August 2019 Settlement Agreement | WPS | Electric rates | 2021 rates | Tax Cuts and Jobs Act of 2017 |  |
Public Utilities, General Disclosures [Line Items] |  |
Amortization of regulatory liabilities | 39 |
August 2019 Settlement Agreement | WPS | Electric rates | 2020 and 2021 rates | Earnings sharing mechanisms |  |
Public Utilities, General Disclosures [Line Items] |  |
Amortization of regulatory liabilities | 21 |
August 2019 Settlement Agreement | WPS | Natural gas rates | 2020 rates |  |
Public Utilities, General Disclosures [Line Items] |  |
Requested rate increase | $ 4 |
Requested rate increase (as a percent) | 1.40% |
August 2019 Settlement Agreement | WPS | Natural gas rates | 2020 rates | Tax Cuts and Jobs Act of 2017 |  |
Public Utilities, General Disclosures [Line Items] |  |
Amortization of regulatory liabilities | $ 5 |
August 2019 Settlement Agreement | WPS | Natural gas rates | 2021 rates | Tax Cuts and Jobs Act of 2017 |  |
Public Utilities, General Disclosures [Line Items] |  |
Amortization of regulatory liabilities | $ 5 |
March 2019 Rate Application | Electric rates | Tax Cuts and Jobs Act of 2017 |  |
Public Utilities, General Disclosures [Line Items] |  |
Amortization period |  | 40 years
Period of time over which a significant amount of refunds would be made |  | 2 years
March 2019 Rate Application | Natural gas rates | Tax Cuts and Jobs Act of 2017 |  |
Public Utilities, General Disclosures [Line Items] |  |
Amortization period |  | 40 years
Period of time over which a significant amount of refunds would be made |  | 2 years
March 2019 Rate Application | WE | 2020 and 2021 rates |  |
Public Utilities, General Disclosures [Line Items] |  |
Requested return on equity (as a percent) |  | 10.35%
Requested common equity component average (as a percent) |  | 52.00%
March 2019 Rate Application | WE | Electric rates | 2020 rates |  |
Public Utilities, General Disclosures [Line Items] |  |
Requested rate increase |  | $ 83
Requested rate increase (as a percent) |  | 2.90%
March 2019 Rate Application | WE | Electric rates | 2020 rates | Tax Cuts and Jobs Act of 2017 |  |
Public Utilities, General Disclosures [Line Items] |  |
Amortization of regulatory liabilities |  | $ 94
March 2019 Rate Application | WE | Electric rates | 2021 rates |  |
Public Utilities, General Disclosures [Line Items] |  |
Requested rate increase |  | $ 83
Requested rate increase (as a percent) |  | 2.90%
March 2019 Rate Application | WE | Electric rates | 2021 rates | Tax Cuts and Jobs Act of 2017 |  |
Public Utilities, General Disclosures [Line Items] |  |
Amortization of regulatory liabilities |  | $ 17
March 2019 Rate Application | WE | Natural gas rates | 2020 rates |  |
Public Utilities, General Disclosures [Line Items] |  |
Requested rate increase |  | $ 15
Requested rate increase (as a percent) |  | 3.90%
March 2019 Rate Application | WE | Steam rates | 2020 rates |  |
Public Utilities, General Disclosures [Line Items] |  |
Requested rate increase |  | $ 1
Requested rate increase (as a percent) |  | 4.50%
March 2019 Rate Application | WG | 2020 and 2021 rates |  |
Public Utilities, General Disclosures [Line Items] |  |
Requested return on equity (as a percent) |  | 10.30%
Requested common equity component average (as a percent) |  | 52.00%
March 2019 Rate Application | WG | Natural gas rates | 2020 rates |  |
Public Utilities, General Disclosures [Line Items] |  |
Requested rate increase |  | $ 11
Requested rate increase (as a percent) |  | 1.80%
March 2019 Rate Application | WPS | 2020 and 2021 rates |  |
Public Utilities, General Disclosures [Line Items] |  |
Requested return on equity (as a percent) |  | 10.35%
Requested common equity component average (as a percent) |  | 52.00%
March 2019 Rate Application | WPS | Electric rates | 2020 rates |  |
Public Utilities, General Disclosures [Line Items] |  |
Requested rate increase |  | $ 49
Requested rate increase (as a percent) |  | 4.90%
March 2019 Rate Application | WPS | Electric rates | 2020 rates | Tax Cuts and Jobs Act of 2017 |  |
Public Utilities, General Disclosures [Line Items] |  |
Amortization of regulatory liabilities |  | $ 16
March 2019 Rate Application | WPS | Electric rates | 2020 rates | Earnings sharing mechanisms |  |
Public Utilities, General Disclosures [Line Items] |  |
Amortization of regulatory liabilities |  | 21
March 2019 Rate Application | WPS | Electric rates | 2021 rates |  |
Public Utilities, General Disclosures [Line Items] |  |
Requested rate increase |  | $ 49
Requested rate increase (as a percent) |  | 4.90%
March 2019 Rate Application | WPS | Electric rates | 2021 rates | Tax Cuts and Jobs Act of 2017 |  |
Public Utilities, General Disclosures [Line Items] |  |
Amortization of regulatory liabilities |  | $ 24
March 2019 Rate Application | WPS | Natural gas rates | 2020 rates |  |
Public Utilities, General Disclosures [Line Items] |  |
Requested rate increase |  | $ 7
Requested rate increase (as a percent) |  | 2.40%
March 2019 Rate Application | WPS | Natural gas rates | 2020 rates | Tax Cuts and Jobs Act of 2017 |  |
Public Utilities, General Disclosures [Line Items] |  |
Amortization of regulatory liabilities |  | $ 7
March 2019 Rate Application | WPS | Natural gas rates | 2021 rates |  |
Public Utilities, General Disclosures [Line Items] |  |
Requested rate increase |  | $ 7
Requested rate increase (as a percent) |  | 2.40%

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