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Earnings Per Share (Details) (USD $)
Share data in Millions, except Per Share data
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Basic Earnings per Share    
Net Income Attributable to DTE Energy Company$ 183,000,000$ 163,000,000$ 561,000,000$ 478,000,000
Average number of common shares outstanding169169169168
Weighted average net restricted shares outstanding1111
Dividends declared - common shares99,000,00094,000,000293,000,000271,000,000
Dividends declared - net restricted shares01,000,0001,000,0001,000,000
Total distributed earnings99,000,00095,000,000294,000,000272,000,000
Net income less distributed earnings84,000,00068,000,000267,000,000206,000,000
Distributed (dividends per common share)$ 0.59$ 0.56$ 1.74$ 1.62
Undistributed$ 0.49$ 0.41$ 1.57$ 1.23
Total Basic Earnings per Common Share$ 1.08$ 0.97$ 3.31$ 2.85
Diluted Earnings per Share    
Net Income Attributable to DTE Energy Company183,000,000163,000,000561,000,000478,000,000
Average number of common shares outstanding169169169168
Average incremental shares from assumed exercise of options1110
Common shares for dilutive calculation170170170168
Weighted average net restricted shares outstanding1111
Dividends declared - common shares99,000,00094,000,000293,000,000271,000,000
Dividends declared - net restricted shares01,000,0001,000,0001,000,000
Total distributed earnings99,000,00095,000,000294,000,000272,000,000
Net income less distributed earnings84,000,00068,000,000267,000,000206,000,000
Earnings Per Share, Diluted, Distributed$ 0.59$ 0.56$ 1.74$ 1.62
Undistributed Earnings, Diluted$ 0.48$ 0.40$ 1.56$ 1.22
Total Diluted Earnings per Common Share$ 1.07$ 0.96$ 3.30$ 2.84