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Financings and Capitalization (Debt Maturities) (Details) $ in Millions | Dec. 31, 2019 USD ($)
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Debt Instrument [Line Items] |
2020 | $ 1,111
2021 | 538
2022 | 1,354
2023 | 669
2024 | 808
Consumers Energy Company |
Debt Instrument [Line Items] |
2020 | 202
2021 | 27
2022 | 653
2023 | 354
2024 | $ 332

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