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Fair Value (Assets and Liabilities Recorded at Fair Value on a Recurring Basis) (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Derivative assets    
Derivative assets, gross $ 1,041 $ 567
Derivative asset, netting (820) (411)
Derivative assets, net 221 156
Derivative liabilities    
Derivative liabilities, gross (1,216) (533)
Derivative liability, netting 820 405
Derivative liabilities, net (396) (128)
DTE Electric    
Assets    
Nuclear decommissioning trusts 2,019 1,855
Current liabilities    
Derivative liabilities    
Derivative liabilities, gross (855) (386)
Noncurrent liabilities    
Derivative liabilities    
Derivative liabilities, gross (361) (147)
Natural gas    
Derivative assets    
Derivative assets, gross 336 233
Derivative asset, netting (289) (156)
Derivative assets, net 47 77
Derivative liabilities    
Derivative liabilities, gross (528) (223)
Derivative liability, netting 289 151
Derivative liabilities, net (239) (72)
Electricity    
Derivative assets    
Derivative assets, gross 330 180
Derivative asset, netting (192) (120)
Derivative assets, net 138 60
Derivative liabilities    
Derivative liabilities, gross (325) (168)
Derivative liability, netting 192 125
Derivative liabilities, net (133) (43)
Environmental & Other    
Derivative assets    
Derivative assets, gross 375 154
Derivative asset, netting (339) (135)
Derivative assets, net 36 19
Derivative liabilities    
Derivative liabilities, gross (356) (137)
Derivative liability, netting 339 129
Derivative liabilities, net (17) (8)
Foreign currency exchange contracts    
Derivative liabilities    
Derivative liabilities, gross (7) (5)
Derivative liability, netting 0 0
Derivative liabilities, net (7) (5)
Cash equivalents | DTE Electric    
Assets    
Nuclear decommissioning trusts 34 27
Private equity and other | DTE Electric    
Assets    
Nuclear decommissioning trusts 159 104
Equity securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 1,168 1,169
Fixed income securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 658 555
Recurring    
Assets    
Cash equivalents 3,325 438
Derivative assets    
Derivative asset, netting (820) (411)
Derivative assets, net 221 156
Total assets 5,720 2,609
Derivative liabilities    
Derivative liability, netting 820 405
Derivative liabilities, net (396) (128)
Net Assets (Liabilities) at end of period 5,324 2,481
Net Assets at end of period, netting 0 (6)
Recurring | DTE Electric    
Assets    
Cash equivalents 0 4
Derivative assets    
Total assets 2,063 1,890
Recurring | Current assets    
Derivative assets    
Derivative asset, netting (623) (330)
Total assets 3,496 554
Recurring | Current assets | DTE Electric    
Derivative assets    
Total assets 15 8
Recurring | Noncurrent assets    
Derivative assets    
Derivative asset, netting (197) (81)
Total assets 2,224 2,055
Recurring | Noncurrent assets | DTE Electric    
Derivative assets    
Total assets 2,048 1,882
Recurring | Current liabilities    
Derivative liabilities    
Derivative liability, netting 623 318
Derivative liabilities, net (232) (68)
Recurring | Noncurrent liabilities    
Derivative liabilities    
Derivative liability, netting 197 87
Derivative liabilities, net (164) (60)
Recurring | Restricted cash    
Assets    
Cash equivalents 1 2
Recurring | Natural gas    
Derivative assets    
Derivative asset, netting (289) (156)
Derivative assets, net 47 77
Derivative liabilities    
Derivative liability, netting 289 151
Derivative liabilities, net (239) (72)
Recurring | Electricity    
Derivative assets    
Derivative asset, netting (192) (120)
Derivative assets, net 138 60
Derivative liabilities    
Derivative liability, netting 192 125
Derivative liabilities, net (133) (43)
Recurring | Environmental & Other    
Derivative assets    
Derivative asset, netting (339) (135)
Derivative assets, net 36 19
Derivative liabilities    
Derivative liability, netting 339 129
Derivative liabilities, net (17) (8)
Recurring | Foreign currency exchange contracts    
Derivative liabilities    
Derivative liability, netting 0 0
Derivative liabilities, net (7) (5)
Recurring | Derivative assets — FTRs | DTE Electric    
Derivative assets    
Derivative assets, net 15 4
Recurring | Cash equivalents    
Assets    
Nuclear decommissioning trusts 34 27
Other investments 86 97
Recurring | Cash equivalents | DTE Electric    
Assets    
Nuclear decommissioning trusts 34 27
Other investments 11 11
Recurring | Private equity and other    
Assets    
Nuclear decommissioning trusts 159 104
Recurring | Private equity and other | DTE Electric    
Assets    
Nuclear decommissioning trusts 159 104
Recurring | Equity securities    
Assets    
Nuclear decommissioning trusts 1,168 1,169
Other investments 62 55
Recurring | Equity securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 1,168 1,169
Other investments 18 16
Recurring | Fixed income securities    
Assets    
Nuclear decommissioning trusts 658 555
Other investments 7 8
Recurring | Fixed income securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 658 555
Recurring | Level 1    
Assets    
Cash equivalents 3,325 438
Derivative assets    
Derivative assets, gross 181 99
Total assets 4,781 1,773
Derivative liabilities    
Derivative liabilities, gross (131) (88)
Net Assets (Liabilities) at end of period 4,650 1,685
Recurring | Level 1 | DTE Electric    
Assets    
Cash equivalents 0 4
Derivative assets    
Total assets 1,149 1,107
Recurring | Level 1 | Current assets    
Derivative assets    
Total assets 3,480 532
Recurring | Level 1 | Current assets | DTE Electric    
Derivative assets    
Total assets 0 4
Recurring | Level 1 | Noncurrent assets    
Derivative assets    
Total assets 1,301 1,241
Recurring | Level 1 | Noncurrent assets | DTE Electric    
Derivative assets    
Total assets 1,149 1,103
Recurring | Level 1 | Current liabilities    
Derivative liabilities    
Derivative liabilities, gross (124) (84)
Recurring | Level 1 | Noncurrent liabilities    
Derivative liabilities    
Derivative liabilities, gross (7) (4)
Recurring | Level 1 | Natural gas    
Derivative assets    
Derivative assets, gross 180 99
Derivative liabilities    
Derivative liabilities, gross (131) (88)
Recurring | Level 1 | Electricity    
Derivative assets    
Derivative assets, gross 0 0
Derivative liabilities    
Derivative liabilities, gross 0 0
Recurring | Level 1 | Environmental & Other    
Derivative assets    
Derivative assets, gross 1 0
Derivative liabilities    
Derivative liabilities, gross 0 0
Recurring | Level 1 | Foreign currency exchange contracts    
Derivative liabilities    
Derivative liabilities, gross 0 0
Recurring | Level 1 | Derivative assets — FTRs | DTE Electric    
Derivative assets    
Derivative assets, net 0 0
Recurring | Level 1 | Cash equivalents    
Assets    
Nuclear decommissioning trusts 34 27
Other investments 86 97
Recurring | Level 1 | Cash equivalents | DTE Electric    
Assets    
Nuclear decommissioning trusts 34 27
Other investments 11 11
Recurring | Level 1 | Private equity and other    
Assets    
Nuclear decommissioning trusts 0 0
Recurring | Level 1 | Private equity and other | DTE Electric    
Assets    
Nuclear decommissioning trusts 0 0
Recurring | Level 1 | Equity securities    
Assets    
Nuclear decommissioning trusts 952 947
Other investments 62 55
Recurring | Level 1 | Equity securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 952 947
Other investments 18 16
Recurring | Level 1 | Fixed income securities    
Assets    
Nuclear decommissioning trusts 134 102
Other investments 7 8
Recurring | Level 1 | Fixed income securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 134 102
Recurring | Level 2    
Assets    
Cash equivalents 0 0
Derivative assets    
Derivative assets, gross 724 352
Total assets 1,149 723
Derivative liabilities    
Derivative liabilities, gross (734) (327)
Net Assets (Liabilities) at end of period 415 396
Recurring | Level 2 | DTE Electric    
Assets    
Cash equivalents 0 0
Derivative assets    
Total assets 425 371
Recurring | Level 2 | Current assets    
Derivative assets    
Total assets 530 260
Recurring | Level 2 | Current assets | DTE Electric    
Derivative assets    
Total assets 0 0
Recurring | Level 2 | Noncurrent assets    
Derivative assets    
Total assets 619 463
Recurring | Level 2 | Noncurrent assets | DTE Electric    
Derivative assets    
Total assets 425 371
Recurring | Level 2 | Current liabilities    
Derivative liabilities    
Derivative liabilities, gross (511) (223)
Recurring | Level 2 | Noncurrent liabilities    
Derivative liabilities    
Derivative liabilities, gross (223) (104)
Recurring | Level 2 | Natural gas    
Derivative assets    
Derivative assets, gross 110 74
Derivative liabilities    
Derivative liabilities, gross (170) (59)
Recurring | Level 2 | Electricity    
Derivative assets    
Derivative assets, gross 255 128
Derivative liabilities    
Derivative liabilities, gross (201) (126)
Recurring | Level 2 | Environmental & Other    
Derivative assets    
Derivative assets, gross 359 150
Derivative liabilities    
Derivative liabilities, gross (356) (137)
Recurring | Level 2 | Foreign currency exchange contracts    
Derivative liabilities    
Derivative liabilities, gross (7) (5)
Recurring | Level 2 | Derivative assets — FTRs | DTE Electric    
Derivative assets    
Derivative assets, net 0 0
Recurring | Level 2 | Cash equivalents    
Assets    
Nuclear decommissioning trusts 0 0
Other investments 0 0
Recurring | Level 2 | Cash equivalents | DTE Electric    
Assets    
Nuclear decommissioning trusts 0 0
Other investments 0 0
Recurring | Level 2 | Private equity and other    
Assets    
Nuclear decommissioning trusts 0 0
Recurring | Level 2 | Private equity and other | DTE Electric    
Assets    
Nuclear decommissioning trusts 0 0
Recurring | Level 2 | Equity securities    
Assets    
Nuclear decommissioning trusts 0 0
Other investments 0 0
Recurring | Level 2 | Equity securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 0 0
Other investments 0 0
Recurring | Level 2 | Fixed income securities    
Assets    
Nuclear decommissioning trusts 425 371
Other investments 0 0
Recurring | Level 2 | Fixed income securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 425 371
Recurring | Level 3    
Assets    
Cash equivalents 0 0
Derivative assets    
Derivative assets, gross 136 116
Total assets 136 116
Derivative liabilities    
Derivative liabilities, gross (351) (118)
Net Assets (Liabilities) at end of period (215) (2)
Recurring | Level 3 | DTE Electric    
Assets    
Cash equivalents 0 0
Derivative assets    
Total assets 15 4
Recurring | Level 3 | Current assets    
Derivative assets    
Total assets 109 92
Recurring | Level 3 | Current assets | DTE Electric    
Derivative assets    
Total assets 15 4
Recurring | Level 3 | Noncurrent assets    
Derivative assets    
Total assets 27 24
Recurring | Level 3 | Noncurrent assets | DTE Electric    
Derivative assets    
Total assets 0 0
Recurring | Level 3 | Current liabilities    
Derivative liabilities    
Derivative liabilities, gross (220) (79)
Recurring | Level 3 | Noncurrent liabilities    
Derivative liabilities    
Derivative liabilities, gross (131) (39)
Recurring | Level 3 | Natural gas    
Derivative assets    
Derivative assets, gross 46 60
Derivative liabilities    
Derivative liabilities, gross (227) (76)
Recurring | Level 3 | Electricity    
Derivative assets    
Derivative assets, gross 75 52
Derivative liabilities    
Derivative liabilities, gross (124) (42)
Recurring | Level 3 | Environmental & Other    
Derivative assets    
Derivative assets, gross 15 4
Derivative liabilities    
Derivative liabilities, gross 0 0
Recurring | Level 3 | Foreign currency exchange contracts    
Derivative liabilities    
Derivative liabilities, gross 0
Recurring | Level 3 | Derivative assets — FTRs | DTE Electric    
Derivative assets    
Derivative assets, net 15 4
Recurring | Level 3 | Cash equivalents    
Assets    
Nuclear decommissioning trusts 0 0
Other investments 0 0
Recurring | Level 3 | Cash equivalents | DTE Electric    
Assets    
Nuclear decommissioning trusts 0 0
Other investments 0 0
Recurring | Level 3 | Private equity and other    
Assets    
Nuclear decommissioning trusts 0 0
Recurring | Level 3 | Private equity and other | DTE Electric    
Assets    
Nuclear decommissioning trusts 0 0
Recurring | Level 3 | Equity securities    
Assets    
Nuclear decommissioning trusts 0 0
Other investments 0 0
Recurring | Level 3 | Equity securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 0 0
Other investments 0 0
Recurring | Level 3 | Fixed income securities    
Assets    
Nuclear decommissioning trusts 0 0
Other investments 0 0
Recurring | Level 3 | Fixed income securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 0 0
Recurring | Other    
Derivative assets    
Total assets 474 408
Derivative liabilities    
Net Assets (Liabilities) at end of period 474 408
Recurring | Other | DTE Electric    
Derivative assets    
Total assets 474 408
Recurring | Other | Noncurrent assets    
Derivative assets    
Total assets 474 408
Recurring | Other | Noncurrent assets | DTE Electric    
Derivative assets    
Total assets 474 408
Recurring | Other | Private equity and other    
Assets    
Nuclear decommissioning trusts 159 104
Recurring | Other | Private equity and other | DTE Electric    
Assets    
Nuclear decommissioning trusts 159 104
Recurring | Other | Equity securities    
Assets    
Nuclear decommissioning trusts 216 222
Recurring | Other | Equity securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 216 222
Recurring | Other | Fixed income securities    
Assets    
Nuclear decommissioning trusts 99 82
Recurring | Other | Fixed income securities | DTE Electric    
Assets    
Nuclear decommissioning trusts $ 99 $ 82