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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, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Net Income | $ 107 | $ 148 | $ 68 | $ 202 | $ 97 | $ 94 | $ 84 | $ 204 | $ 525 | $ 479 | $ 454
Deferred income taxes |  |  |  |  |  |  |  |  | 228 | 229 | 271
Accounts and notes receivable |  |  |  |  |  |  |  |  | 120 | (31) | (120)
Accounts payable |  |  |  |  |  |  |  |  | (26) | 50 | 4
Other current and non-current assets and liabilities |  |  |  |  |  |  |  |  | (19) | (15) | (88)
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 1,640 | 1,447 | 1,421
Net cash used in investing activities |  |  |  |  |  |  |  |  | (2,044) | (1,910) | (1,532)
Proceeds from issuance of debt |  |  |  |  |  |  |  |  | 599 | 1,428 | 1,025
Issuance of common stock |  |  |  |  |  |  |  |  | 43 | 43 | 36
Retirement of long-term debt |  |  |  |  |  |  |  |  | (224) | (750) | (741)
Increase (decrease) in notes payable |  |  |  |  |  |  |  |  | 189 | (110) | 60
Net cash provided by financing activities |  |  |  |  |  |  |  |  | 463 | 498 | 190
Net Increase (Decrease) in Cash and Cash Equivalents |  |  |  |  |  |  |  |  | 59 | 35 | 79
Cash and Cash Equivalents, Beginning of Period |  |  |  | $ 207 |  |  |  | $ 172 | 207 | 172 | 93
Cash and Cash Equivalents, End of Period | $ 266 |  |  |  | $ 207 |  |  |  | 266 | 207 | 172
CMS Energy [Member] |  |  |  |  |  |  |  |  |  |  |
Net Income |  |  |  |  |  |  |  |  | 523 | 477 | 452
Equity earnings of subsidiaries |  |  |  |  |  |  |  |  | (625) | (585) | (566)
Dividends received from subsidiaries |  |  |  |  |  |  |  |  | 499 | 544 | 435
Deferred income taxes |  |  |  |  |  |  |  |  | (24) | 30 | 48
Accounts and notes receivable |  |  |  |  |  |  |  |  | (86) | (3) | (3)
Accounts payable |  |  |  |  |  |  |  |  | 16 | (2) | 2
Accrued taxes |  |  |  |  |  |  |  |  | (115) | 97 | 48
Other current and non-current assets and liabilities |  |  |  |  |  |  |  |  | 21 | 31 | 18
Net cash provided by operating activities |  |  |  |  |  |  |  |  | 209 | 589 | 434
Investment in subsidiaries |  |  |  |  |  |  |  |  | (150) | (495) | (150)
Return of capital |  |  |  |  |  |  |  |  |  | 178 |
Net cash used in investing activities |  |  |  |  |  |  |  |  | (150) | (317) | (150)
Proceeds from issuance of debt |  |  |  |  |  |  |  |  | 349 | 550 | 275
Issuance of common stock |  |  |  |  |  |  |  |  | 43 | 43 | 36
Retirement of long-term debt |  |  |  |  |  |  |  |  | (100) | (547) | (275)
Payment of dividends on common stock |  |  |  |  |  |  |  |  | (320) | (293) | (271)
Debt issuance costs and financing fees |  |  |  |  |  |  |  |  | (3) | (6) | (4)
Increase (decrease) in notes payable |  |  |  |  |  |  |  |  | (28) | (19) | (47)
Net cash provided by financing activities |  |  |  |  |  |  |  |  | $ (59) | $ (272) | (286)
Net Increase (Decrease) in Cash and Cash Equivalents |  |  |  |  |  |  |  |  |  |  | (2)
Cash and Cash Equivalents, Beginning of Period |  |  |  |  |  |  |  |  |  |  | $ 2
Cash and Cash Equivalents, End of Period |  |  |  |  |  |  |  |  |  |  |

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