Regulatory Matters (Tables) - Consumers Energy Company [Member]

12 Months Ended

Dec. 31, 2017

Public Utility, Property, Plant and Equipment [Line Items]

Schedule of Regulatory Assets and Liabilities

In Millions
December 31	End of Recovery  or Refund Period	2017			2016
Regulatory assets
Current
Energy waste reduction plan incentive1	2018		$	18		$	17
Other	2018			2			-
Total current regulatory assets			$	20		$	17
Non-current
Postretirement benefits2	various		$	1,028		$	1,373
Securitized costs3	2029			298			323
ARO4	various			161			166
MGP sites4	various			142			139
Unamortized loss on reacquired debt4	various			53			54
Energy waste reduction plan4	various			39			1
Energy waste reduction plan incentive1	2019			31			18
Gas storage inventory adjustments4	various			10			14
Other	various			2			3
Total non-current regulatory assets			$	1,764		$	2,091
Total regulatory assets			$	1,784		$	2,108
Regulatory liabilities
Current
Income taxes, net	2018		$	52		$	64
Other	2018			28			31
Total current regulatory liabilities			$	80		$	95
Non-current
Cost of removal	various		$	1,844		$	1,809
Income taxes, net	various			1,564			7
Postretirement benefits	various			135			-
Renewable energy plan	2028			56			83
Renewable energy grant	2043			56			58
ARO	various			50			62
Energy waste reduction plan	various			-			11
Other	various			10			11
Total non-current regulatory liabilities			$	3,715		$	2,041
Total regulatory liabilities			$	3,795		$	2,136

1These regulatory assets have arisen from an alternative revenue program and are not associated with incurred costs or capital investments. Therefore, the MPSC has provided for recovery without a return.

2This regulatory asset is offset partially by liabilities. The net amount is included in rate base, thereby providing a return.

3The MPSC has authorized a specific return on this regulatory asset.

4These regulatory assets represent incurred costs for which the MPSC has provided, or Consumers expects, recovery without a return on investment.

Schedule of Assets and Liabilities for PSCR and GCR Underrecoveries and Overrecoveries

In Millions
December 31	2017			2016
Liabilities
PSCR overrecoveries		$	27		$	8
GCR overrecoveries			6			13
Accrued rate refunds		$	33		$	21

Electric Rate Case [Member]

Public Utility, Property, Plant and Equipment [Line Items]

Schedule of Requested Annual Rate Increase

In Millions
Components of the rate increase
Investment in rate base	$	45
Operating and maintenance costs		42
Gross margin		42
Cost of capital		28
Working capital		(9)
Total	$	148