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