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New Accounting Standards (Tables) | 12 Months Ended
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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 |
﻿

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- Definition Tabular disclosure of changes in accounting principles, including adoption of new accounting pronouncements, that describes the new methods, amount and effects on financial statement line items. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22580-107794 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Direct Effects of a Change in Accounting Principle -URI http://asc.fasb.org/extlink&oid=66092750 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Indirect Effects of a Change in Accounting Principle -URI http://asc.fasb.org/extlink&oid=6515603 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=68064558&loc=d3e765-108305 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Accounting Change -URI http://asc.fasb.org/extlink&oid=6503790 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22499-107794 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.10-01.(b)(6)) -URI http://asc.fasb.org/extlink&oid=27015980&loc=d3e46468-122699 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64853466&loc=d3e22583-107794 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Change in Accounting Principle -URI http://asc.fasb.org/extlink&oid=6507316 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=68064558&loc=d3e725-108305 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Retrospective Application -URI http://asc.fasb.org/extlink&oid=6523989 + Details
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