Stockholders' Equity	6 Months Ended
Stockholders' Equity	Jun. 30, 2011
Stockholders' Equity [Abstract]
STOCKHOLDERS' EQUITY	NOTE 11. STOCKHOLDERS’ EQUITY In August 2011, UniSource Energy declared a second quarter dividend of $0.42 per share to shareholders of UniSource Energy Common Stock. The dividend will be paid in September 2011. In July 2011, UES contributed $20 million of capital to UNS Electric, using a $20 million capital contribution that UES received from UniSource Energy. In July 2011, UED paid a dividend of $36 million to UniSource Energy, $25 million of which represented a return of capital. In February 2010, UED paid a dividend to UniSource Energy of $9 million, $4 million of which represented a return of capital. In February 2011 and in April 2010, UES paid a dividend of $10 million to UniSource Energy, using dividend funds received from UNS Gas. Millennium paid dividends which represented return of capital distributions to UniSource Energy of $6 million in the quarter ended March 31, 2010. In March 2010, UniSource Energy contributed $15 million of capital to TEP.

Disclosures related to accounts comprising shareholders' equity, including other comprehensive income. Includes: (1) balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings; (2) accumulated balance for each classification of other comprehensive income and total amount of comprehensive income; (3) amount and nature of changes in separate accounts, including the number of shares authorized and outstanding, number of shares issued upon exercise and conversion, and for other comprehensive income, the adjustments for reclassifications to net income; (4) rights and privileges of each class of stock authorized; (5) basis of treasury stock, if other than cost, and amounts paid and accounting treatment for treasury stock purchased significantly in excess of market; (6) dividends paid or payable per share and in the aggregate for each class of stock for each period presented; (7) dividend restrictions and accumulated preferred dividends in arrears (in aggregate and per share amount); (8) retained earnings appropriations or restrictions, such as dividend restrictions; (9) impact of change in accounting principle, initial adoption of new accounting principle and correction of an error in previously issued financial statements; (10) shares held in trust for Employee Stock Ownership Plan (ESOP); (11) deferred compensation related to issuance of capital stock; (12) note received for issuance of stock; (13) unamortized discount on shares; (14) description, terms and number of warrants or rights outstanding; (15) shares under subscription and subscription receivables; effective date of new retained earnings after quasi-reorganization and deficit eliminated by quasi-reorganization and, for a period of at least ten years after the effective date, the point in time from which the new retained dates; and (16) retroactive effective of subsequent change in capital structure.

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