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Earnings Per Share (Details) (USD $)
Share data in Millions, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Basic Earnings per Share                      
Net Income Attributable to DTE Energy Company $ 150,000,000 $ 183,000,000 $ 202,000,000 $ 176,000,000 $ 152,000,000 $ 163,000,000 $ 86,000,000 $ 229,000,000 $ 711,000,000 $ 630,000,000 $ 532,000,000
Average number of common shares outstanding                 169 168 164
Weighted average net restricted shares outstanding                 1 1 1
Dividends declared - common shares                 392,000,000 365,000,000 347,000,000
Dividends declared - net restricted shares                 1,000,000 2,000,000 2,000,000
Total distributed earnings                 393,000,000 367,000,000 349,000,000
Net income less distributed earnings                 318,000,000 263,000,000 183,000,000
Distributed (dividends per common share)                 $ 2.32 $ 2.18 $ 2.12
Undistributed                 $ 1.87 $ 1.57 $ 1.12
Total Basic Earnings per Common Share $ 0.88 $ 1.08 $ 1.19 $ 1.04 $ 0.90 $ 0.97 $ 0.51 $ 1.38 $ 4.19 $ 3.75 $ 3.24
Diluted Earnings per Share                      
Net Income Attributable to DTE Energy Company 150,000,000 183,000,000 202,000,000 176,000,000 152,000,000 163,000,000 86,000,000 229,000,000 711,000,000 630,000,000 532,000,000
Average number of common shares outstanding                 169 168 164
Average incremental shares from assumed exercise of options                 1 1 0
Common shares for dilutive calculation                 170 169 164
Weighted average net restricted shares outstanding                 1 1 1
Dividends declared - common shares                 392,000,000 365,000,000 347,000,000
Dividends declared - net restricted shares                 1,000,000 2,000,000 2,000,000
Total distributed earnings                 393,000,000 367,000,000 349,000,000
Net income less distributed earnings                 318,000,000 263,000,000 183,000,000
Distributed (dividends per common share)                 $ 2.32 $ 2.18 $ 2.12
Undistributed                 $ 1.86 $ 1.56 $ 1.12
Total Diluted Earnings per Common Share $ 0.88 $ 1.07 $ 1.19 $ 1.04 $ 0.90 $ 0.96 $ 0.51 $ 1.38 $ 4.18 $ 3.74 $ 3.24