New Accounting Standards (Tables)

12 Months Ended

Dec. 31, 2016

Schedule Of Restricted Cash Balances

In Millions
Years Ended December 31	2015			2014
CMS Energy, including Consumers
Increase (decrease) in:
Cash and cash equivalents, including restricted amounts, beginning of period		$	42		$	32
Net cash used in investing activities			(20)			10
Cash and cash equivalents, including restricted amounts, end of period			22			42
Consumers
Increase (decrease) in:
Cash and cash equivalents, including restricted amounts, beginning of period		$	41		$	31
Net cash used in investing activities			(20)			10
Cash and cash equivalents, including restricted amounts, end of period			21			41

Consumers Energy Company [Member]

Schedule Of Restricted Cash Balances

In Millions
Years Ended December 31	2015			2014
CMS Energy, including Consumers
Increase (decrease) in:
Cash and cash equivalents, including restricted amounts, beginning of period		$	42		$	32
Net cash used in investing activities			(20)			10
Cash and cash equivalents, including restricted amounts, end of period			22			42
Consumers
Increase (decrease) in:
Cash and cash equivalents, including restricted amounts, beginning of period		$	41		$	31
Net cash used in investing activities			(20)			10
Cash and cash equivalents, including restricted amounts, end of period			21			41