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Schedule I - Condensed Financial Information of Registrant (Statements of Cash Flows) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Net Income | $ 454 | $ 384 | $ 417
Deferred income taxes | 271 | 226 | 169
Accounts and notes receivable | (120) | (147) | 119
Accounts payable | 6 | (5) | 30
Other current and non-current assets and liabilities | (106) | (70) | (7)
Net cash provided by operating activities | 1,421 | 1,241 | 1,169
Net cash used in investing activities | (1,532) | (1,350) | (1,058)
Proceeds from issuance of long-term debt | 1,025 | 1,650 | 375
Issuance of common stock | 36 | 30 | 29
Retirement of long-term debt | (741) | (1,527) | (413)
Redemption of preferred stock | (7) |  |
Increase (decrease) in notes payable | 60 | 110 |
Net cash provided by (used in) financing activities | 190 | 41 | (199)
Net Increase (Decrease) in Cash and Cash Equivalents | 79 | (68) | (86)
Cash and Cash Equivalents, Beginning of Period | 93 | 161 | 247
Cash and Cash Equivalents, End of Period | 172 | 93 | 161
CMS Energy [Member] |  |  |
Net Income | 452 | 382 | 415
Equity earnings of subsidiaries | (566) | (477) | (510)
Dividends received from subsidiaries | 435 | 401 | 474
Deferred income taxes | 48 | (25) | 14
Accounts and notes receivable | (3) | 2 | (1)
Accounts payable | 2 |  |
Accrued taxes | 48 | 9 | (97)
Other current and non-current assets and liabilities | 18 | (14) | 12
Net cash provided by operating activities | 434 | 278 | 307
Investment in subsidiaries | (150) | (151) | (125)
Net cash used in investing activities | (150) | (151) | (125)
Proceeds from issuance of long-term debt | 275 | 575 | 375
Issuance of common stock | 36 | 30 | 29
Retirement of long-term debt | (275) | (463) | (376)
Payment of common stock dividends | (271) | (252) | (211)
Debt issuance costs and financing fees | (4) | (4) | (6)
Increase (decrease) in notes payable | (47) | (11) | 7
Net cash provided by (used in) financing activities | (286) | (125) | (182)
Net Increase (Decrease) in Cash and Cash Equivalents | (2) | 2 |
Cash and Cash Equivalents, Beginning of Period | 2 |  |
Cash and Cash Equivalents, End of Period |  | $ 2 |

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