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Supplementary Quarterly Financial Information (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract]                      
Operating Revenues $ 4,647 $ 3,715 $ 3,021 $ 3,581 $ 3,080 $ 3,080 $ 2,411 $ 2,852 $ 14,964 $ 11,423 $ 12,168
Operating Income 415 405 242 433 368 479 263 445 1,495 1,555 1,430
Net Income from Continuing Operations 300 55 114 317 206 370 201 268 786 1,045 942
Net Income (Loss) from Discontinued Operations 5 (33) 65 80 69 107 76 74 117 326 230
Net Income 305 22 179 397 275 477 277 342 903 1,371 1,172
Net Income Attributable to DTE Energy Company/DTE Electric Company $ 306 $ 25 $ 179 $ 397 $ 275 $ 476 $ 277 $ 340 $ 907 $ 1,368 $ 1,169
Basic Earnings per Share                      
Continuing operations (in dollars per share) $ 1.56 $ 0.30 $ 0.60 $ 1.65 $ 1.08 $ 1.93 $ 1.06 $ 1.39 $ 4.11 $ 5.46 $ 5.16
Discontinued operations (in dollars per share) 0.02 (0.17) 0.32 0.40 0.34 0.54 0.38 0.38 0.57 1.63 1.16
Basic Earnings per Common Share (in dollars per share) 1.58 0.13 0.92 2.05 1.42 2.47 1.44 1.77 4.68 7.09 6.32
Diluted Earnings per Share                      
Continuing operations (in dollars per share) 1.55 0.30 0.60 1.65 1.08 1.92 1.06 1.39 4.10 5.45 5.15
Discontinued operations (in dollars per share) 0.02 (0.17) 0.32 0.40 0.34 0.54 0.38 0.37 0.57 1.63 1.16
Diluted Earnings per Common Share (in dollars per share) $ 1.57 $ 0.13 $ 0.92 $ 2.05 $ 1.42 $ 2.46 $ 1.44 $ 1.76 $ 4.67 $ 7.08 $ 6.31
Loss on extinguishment of debt   $ 376             $ 393 $ 6 $ 0
Deferred tax benefit for deferred tax remeasurement   $ 85             $ 85