Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Accounts receivable and accrued revenue ALLOWANCE	$ 20	$ 20
Accounts and notes receivable ALLOWANCE	$ 28	$ 24
Common stock, authorized (in shares)	350,000,000.0	350,000,000.0
Common stock, outstanding (in shares)	283,800,000	283,400,000
Consumers Energy Company
Accounts receivable and accrued revenue ALLOWANCE	$ 20	$ 20
Common stock, authorized (in shares)	125,000,000	125,000,000
Common stock, outstanding (in shares)	84,100,000	84,100,000