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Schedule I - Condensed Financial Information of Registrant (Condensed Statements Of Cash Flows) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Net Income | $ 78 | $ 186 | $ 125 | $ 164 | $ 107 | $ 148 | $ 68 | $ 202 | $ 553 | $ 525 | $ 479
Deferred income taxes |  |  |  |  |  |  |  |  | 247 | 228 | 229
Other non-cash operating activities and reconciling adjustments |  |  |  |  |  |  |  |  | 52 | 100 | 58
Accounts and notes receivable |  |  |  |  |  |  |  |  | (155) | 120 | (31)
Accounts payable |  |  |  |  |  |  |  |  | 59 | (26) | 50
Other current and non-current assets and liabilities |  |  |  |  |  |  |  |  | (43) | (19) | 1
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 1,629 | 1,640 | 1,481
Net cash used in investing activities |  |  |  |  |  |  |  |  | (1,915) | (2,064) | (1,898)
Proceeds from issuance of debt |  |  |  |  |  |  |  |  | 1,049 | 599 | 1,428
Issuance of common stock |  |  |  |  |  |  |  |  | 72 | 43 | 43
Retirement of long-term debt |  |  |  |  |  |  |  |  | (728) | (224) | (750)
Debt prepayment costs |  |  |  |  |  |  |  |  | (18) |  | (36)
Increase (decrease) in notes payable |  |  |  |  |  |  |  |  | 149 | 189 | (110)
Net cash provided by (used in) financing activities |  |  |  |  |  |  |  |  | 255 | 463 | 462
Net Increase in Cash and Cash Equivalents, Including Restricted Amounts |  |  |  |  |  |  |  |  | (31) | 39 | 45
Cash and Cash Equivalents, Including Restricted Amounts, Beginning of Period |  |  |  | 288 |  |  |  | 249 | 288 | 249 | 204
Cash and Cash Equivalents, Including Restricted Amounts, End of Period | 257 |  |  |  | 288 |  |  |  | 257 | 288 | 249
CMS Energy [Member] |  |  |  |  |  |  |  |  |  |  |
Net Income |  |  |  |  |  |  |  |  | 551 | 523 | 477
Equity earnings of subsidiaries |  |  |  |  |  |  |  |  | (660) | (625) | (585)
Dividends received from subsidiaries |  |  |  |  |  |  |  |  | 499 | 499 | 544
Deferred income taxes |  |  |  |  |  |  |  |  | (26) | (24) | 30
Other non-cash operating activities and reconciling adjustments |  |  |  |  |  |  |  |  | 18 |  | 20
Accounts and notes receivable |  |  |  |  |  |  |  |  | 85 | (86) | (3)
Accounts payable |  |  |  |  |  |  |  |  | (9) | 16 | (2)
Accrued taxes |  |  |  |  |  |  |  |  | (74) | (115) | 97
Other current and non-current assets and liabilities |  |  |  |  |  |  |  |  | 38 | 21 | 31
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 422 | 209 | 609
Investment in subsidiaries |  |  |  |  |  |  |  |  | (275) | (150) | (495)
Return of capital |  |  |  |  |  |  |  |  |  |  | 178
Net cash used in investing activities |  |  |  |  |  |  |  |  | (275) | (150) | (317)
Proceeds from issuance of debt |  |  |  |  |  |  |  |  | 603 | 349 | 550
Issuance of common stock |  |  |  |  |  |  |  |  | 72 | 43 | 43
Retirement of long-term debt |  |  |  |  |  |  |  |  | (530) | (100) | (547)
Debt prepayment costs |  |  |  |  |  |  |  |  | (18) |  | (20)
Payment of dividends on common stock |  |  |  |  |  |  |  |  | (345) | (320) | (293)
Debt issuance costs and financing fees |  |  |  |  |  |  |  |  | (5) | (3) | (6)
Increase (decrease) in notes payable |  |  |  |  |  |  |  |  | 76 | (28) | (19)
Net cash provided by (used in) financing activities |  |  |  |  |  |  |  |  | (147) | (59) | (292)
Net Increase in Cash and Cash Equivalents, Including Restricted Amounts |  |  |  |  |  |  |  |  |  |  |
Cash and Cash Equivalents, Including Restricted Amounts, Beginning of Period |  |  |  |  |  |  |  |  |  |  |
Cash and Cash Equivalents, Including Restricted Amounts, End of Period |  |  |  |  |  |  |  |  |  |  |

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- Definition Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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- Definition Amount of increase (decrease) in cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; excluding effect from exchange rate change. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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- Definition Amount of cash inflow (outflow) of investing activities, excluding discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3574-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3521-108585 + Details
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