Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions |
Mar. 31, 2020 |
Dec. 31, 2019 |
|---|---|---|
| Accounts receivable and accrued revenue ALLOWANCE | $ 22 | $ 20 |
| Notes receivable – current ALLOWANCE | 33 | 33 |
| Accounts and notes receivable – non-current ALLOWANCE | $ 66 | $ 0 |
| Common stock, authorized (in shares) | 350,000,000.0 | 350,000,000.0 |
| Common stock, outstanding (in shares) | 286,200,000 | 283,900,000 |
| Consumers Energy Company | ||
| Accounts receivable and accrued revenue ALLOWANCE | $ 22 | $ 20 |
| Common stock, authorized (in shares) | 125,000,000 | 125,000,000 |
| Common stock, outstanding (in shares) | 84,100,000 | 84,100,000 |
| Preferred stock, par value (in dollars per share) | $ 4.50 | $ 4.50 |