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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, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Net Income | $ 417 | $ 343 | $ 240
Decrease (increase) in accounts receivable, notes receivable, and accrued revenue | 104 | (105) | (91)
Increase (decrease) in accounts payable | 30 | (7) | (50)
Net cash provided by operating activities | 1,169 | 959 | 848
Net cash used in investing activities | (1,058) | (1,003) | (935)
Proceeds from bank loans and notes | 375 | 1,400 | 1,218
Issuance of common stock | 29 | 10 | 9
Retirement of bank loans and notes | 413 | 878 | 1,154
Payment of common stock dividends | 211 | 154 | 114
Payment of preferred stock dividends | 0 | 8 | 11
Debt issuance costs and financing fees | 10 | 15 | 35
Redemption of preferred stock | 0 | 239 | 4
Increase (decrease) in notes payable | 0 | (40) | 40
Net cash (used in) provided by financing activities | (199) | 202 | (35)
Net change in cash and temporary cash investments | (86) | 157 | (117)
Cash and Cash Equivalents, Beginning of Period | 247 | 90 | 207
Cash and Cash Equivalents, End of Period | 161 | 247 | 90
CMS Energy Corporation [Member] |  |  |
Net Income | 415 | 340 | 229
Equity earnings of subsidiaries | (510) | (464) | (310)
Dividends received from subsidiaries | 474 | 358 | 340
Decrease (increase) in accounts receivable, notes receivable, and accrued revenue | (1) |  | (2)
Increase (decrease) in accounts payable |  | (16) | 16
Change in other assets and liabilities | (71) | 117 | 7
Net cash provided by operating activities | 307 | 335 | 280
Investment in subsidiaries | (125) | (250) | (100)
Net cash used in investing activities | (125) | (250) | (100)
Proceeds from bank loans and notes | 375 | 800 | 718
Issuance of common stock | 29 | 8 | 9
Retirement of bank loans and notes | (376) | (396) | (788)
Payment of common stock dividends | (211) | (154) | (114)
Payment of preferred stock dividends |  | (8) | (11)
Debt issuance costs and financing fees | (6) | (11) | (5)
Redemption of preferred stock |  | (239) | (4)
Increase (decrease) in notes payable | 7 | (85) | 15
Net cash (used in) provided by financing activities | $ (182) | $ (85) | $ (180)

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- Definition Includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits are not generally reported as cash and cash equivalents. Includes cash and cash equivalents associated with the entity's continuing operations. Excludes cash and cash equivalents associated with the disposal group (and discontinued operation). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 7 -Footnote 1 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3044-108585 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 8, 9 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6361293&loc=d3e6676-107765 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 7, 26 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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