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Fair Value (Assets and Liabilities Recorded at Fair Value on a Recurring Basis) (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Derivative assets    
Derivative assets, gross $ 560 $ 567
Derivative asset, netting (450) (411)
Derivative assets, net 110 156
Derivative liabilities    
Derivative liabilities, gross (652) (533)
Derivative liability, netting 444 405
Derivative liabilities, net (208) (128)
DTE Electric    
Assets    
Nuclear decommissioning trusts 1,924 1,855
Current liabilities    
Derivative liabilities    
Derivative liabilities, gross (369) (386)
Noncurrent liabilities    
Derivative liabilities    
Derivative liabilities, gross (283) (147)
Natural gas    
Derivative assets    
Derivative assets, gross 163 233
Derivative asset, netting (106) (156)
Derivative assets, net 57 77
Derivative liabilities    
Derivative liabilities, gross (246) (223)
Derivative liability, netting 108 151
Derivative liabilities, net (138) (72)
Electricity    
Derivative assets    
Derivative assets, gross 138 180
Derivative asset, netting (100) (120)
Derivative assets, net 38 60
Derivative liabilities    
Derivative liabilities, gross (150) (168)
Derivative liability, netting 98 125
Derivative liabilities, net (52) (43)
Environmental & Other    
Derivative assets    
Derivative assets, gross 259 154
Derivative asset, netting (244) (135)
Derivative assets, net 15 19
Derivative liabilities    
Derivative liabilities, gross (250) (137)
Derivative liability, netting 238 129
Derivative liabilities, net (12) (8)
Foreign currency exchange contracts    
Derivative assets    
Derivative assets, gross 0 0
Derivative asset, netting 0 0
Derivative assets, net 0 0
Derivative liabilities    
Derivative liabilities, gross (6) (5)
Derivative liability, netting 0 0
Derivative liabilities, net (6) (5)
Cash equivalents | DTE Electric    
Assets    
Nuclear decommissioning trusts 20 27
Private equity and other | DTE Electric    
Assets    
Nuclear decommissioning trusts 122 104
Equity securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 1,204 1,169
Fixed income securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 578 555
Recurring    
Assets    
Cash equivalents 1,500 438
Derivative assets    
Derivative asset, netting (450) (411)
Derivative assets, net 110 156
Total assets 3,697 2,609
Derivative liabilities    
Derivative liability, netting 444 405
Derivative liabilities, net (208) (128)
Net Assets (Liabilities) at end of period 3,489 2,481
Net Assets at end of period, netting (6) (6)
Recurring | DTE Electric    
Assets    
Cash equivalents 864 4
Derivative assets    
Total assets 2,817 1,890
Recurring | Current assets    
Derivative assets    
Derivative asset, netting (298) (330)
Total assets 1,573 554
Recurring | Current assets | DTE Electric    
Derivative assets    
Total assets 865 8
Recurring | Noncurrent assets    
Derivative assets    
Derivative asset, netting (152) (81)
Total assets 2,124 2,055
Recurring | Noncurrent assets | DTE Electric    
Derivative assets    
Total assets 1,952 1,882
Recurring | Current liabilities    
Derivative liabilities    
Derivative liability, netting 280 318
Derivative liabilities, net (89) (68)
Recurring | Noncurrent liabilities    
Derivative liabilities    
Derivative liability, netting 164 87
Derivative liabilities, net (119) (60)
Recurring | Restricted cash    
Assets    
Cash equivalents 1 2
Recurring | Natural gas    
Derivative assets    
Derivative asset, netting (106) (156)
Derivative assets, net 57 77
Derivative liabilities    
Derivative liability, netting 108 151
Derivative liabilities, net (138) (72)
Recurring | Electricity    
Derivative assets    
Derivative asset, netting (100) (120)
Derivative assets, net 38 60
Derivative liabilities    
Derivative liability, netting 98 125
Derivative liabilities, net (52) (43)
Recurring | Environmental & Other    
Derivative assets    
Derivative asset, netting (244) (135)
Derivative assets, net 15 19
Derivative liabilities    
Derivative liability, netting 238 129
Derivative liabilities, net (12) (8)
Recurring | Foreign currency exchange contracts    
Derivative liabilities    
Derivative liability, netting 0 0
Derivative liabilities, net (6) (5)
Recurring | Derivative assets — FTRs | DTE Electric    
Derivative assets    
Derivative assets, net 1 4
Recurring | Cash equivalents    
Assets    
Nuclear decommissioning trusts 20 27
Other investments 98 97
Recurring | Cash equivalents | DTE Electric    
Assets    
Nuclear decommissioning trusts 20 27
Other investments 11 11
Recurring | Private equity and other    
Assets    
Nuclear decommissioning trusts 122 104
Recurring | Private equity and other | DTE Electric    
Assets    
Nuclear decommissioning trusts 122 104
Recurring | Equity securities    
Assets    
Nuclear decommissioning trusts 1,204 1,169
Other investments 58 55
Recurring | Equity securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 1,204 1,169
Other investments 17 16
Recurring | Fixed income securities    
Assets    
Nuclear decommissioning trusts 578 555
Other investments 7 8
Recurring | Fixed income securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 578 555
Recurring | Level 1    
Assets    
Cash equivalents 1,500 438
Derivative assets    
Derivative assets, gross 49 99
Total assets 2,838 1,773
Derivative liabilities    
Derivative liabilities, gross (36) (88)
Net Assets (Liabilities) at end of period 2,802 1,685
Recurring | Level 1 | DTE Electric    
Assets    
Cash equivalents 864 4
Derivative assets    
Total assets 2,018 1,107
Recurring | Level 1 | Current assets    
Derivative assets    
Total assets 1,545 532
Recurring | Level 1 | Current assets | DTE Electric    
Derivative assets    
Total assets 864 4
Recurring | Level 1 | Noncurrent assets    
Derivative assets    
Total assets 1,293 1,241
Recurring | Level 1 | Noncurrent assets | DTE Electric    
Derivative assets    
Total assets 1,154 1,103
Recurring | Level 1 | Current liabilities    
Derivative liabilities    
Derivative liabilities, gross (34) (84)
Recurring | Level 1 | Noncurrent liabilities    
Derivative liabilities    
Derivative liabilities, gross (2) (4)
Recurring | Level 1 | Natural gas    
Derivative assets    
Derivative assets, gross 49 99
Derivative liabilities    
Derivative liabilities, gross (36) (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 0 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 20 27
Other investments 98 97
Recurring | Level 1 | Cash equivalents | DTE Electric    
Assets    
Nuclear decommissioning trusts 20 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 999 947
Other investments 58 55
Recurring | Level 1 | Equity securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 999 947
Other investments 17 16
Recurring | Level 1 | Fixed income securities    
Assets    
Nuclear decommissioning trusts 107 102
Other investments 7 8
Recurring | Level 1 | Fixed income securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 107 102
Recurring | Level 2    
Assets    
Cash equivalents 0 0
Derivative assets    
Derivative assets, gross 448 352
Total assets 833 723
Derivative liabilities    
Derivative liabilities, gross (446) (327)
Net Assets (Liabilities) at end of period 387 396
Recurring | Level 2 | DTE Electric    
Assets    
Cash equivalents 0 0
Derivative assets    
Total assets 385 371
Recurring | Level 2 | Current assets    
Derivative assets    
Total assets 282 260
Recurring | Level 2 | Current assets | DTE Electric    
Derivative assets    
Total assets 0 0
Recurring | Level 2 | Noncurrent assets    
Derivative assets    
Total assets 551 463
Recurring | Level 2 | Noncurrent assets | DTE Electric    
Derivative assets    
Total assets 385 371
Recurring | Level 2 | Current liabilities    
Derivative liabilities    
Derivative liabilities, gross (252) (223)
Recurring | Level 2 | Noncurrent liabilities    
Derivative liabilities    
Derivative liabilities, gross (194) (104)
Recurring | Level 2 | Natural gas    
Derivative assets    
Derivative assets, gross 72 74
Derivative liabilities    
Derivative liabilities, gross (79) (59)
Recurring | Level 2 | Electricity    
Derivative assets    
Derivative assets, gross 118 128
Derivative liabilities    
Derivative liabilities, gross (111) (126)
Recurring | Level 2 | Environmental & Other    
Derivative assets    
Derivative assets, gross 258 150
Derivative liabilities    
Derivative liabilities, gross (250) (137)
Recurring | Level 2 | Foreign currency exchange contracts    
Derivative liabilities    
Derivative liabilities, gross (6) (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 385 371
Other investments 0 0
Recurring | Level 2 | Fixed income securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 385 371
Recurring | Level 3    
Assets    
Cash equivalents 0 0
Derivative assets    
Derivative assets, gross 63 116
Total assets 63 116
Derivative liabilities    
Derivative liabilities, gross (170) (118)
Net Assets (Liabilities) at end of period (107) (2)
Recurring | Level 3 | DTE Electric    
Assets    
Cash equivalents 0 0
Derivative assets    
Total assets 1 4
Recurring | Level 3 | Current assets    
Derivative assets    
Total assets 44 92
Recurring | Level 3 | Current assets | DTE Electric    
Derivative assets    
Total assets 1 4
Recurring | Level 3 | Noncurrent assets    
Derivative assets    
Total assets 19 24
Recurring | Level 3 | Noncurrent assets | DTE Electric    
Derivative assets    
Total assets 0 0
Recurring | Level 3 | Current liabilities    
Derivative liabilities    
Derivative liabilities, gross (83) (79)
Recurring | Level 3 | Noncurrent liabilities    
Derivative liabilities    
Derivative liabilities, gross (87) (39)
Recurring | Level 3 | Natural gas    
Derivative assets    
Derivative assets, gross 42 60
Derivative liabilities    
Derivative liabilities, gross (131) (76)
Recurring | Level 3 | Electricity    
Derivative assets    
Derivative assets, gross 20 52
Derivative liabilities    
Derivative liabilities, gross (39) (42)
Recurring | Level 3 | Environmental & Other    
Derivative assets    
Derivative assets, gross 1 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 1 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 413 408
Derivative liabilities    
Net Assets (Liabilities) at end of period 413 408
Recurring | Other | DTE Electric    
Derivative assets    
Total assets 413 408
Recurring | Other | Noncurrent assets    
Derivative assets    
Total assets 413 408
Recurring | Other | Noncurrent assets | DTE Electric    
Derivative assets    
Total assets 413 408
Recurring | Other | Private equity and other    
Assets    
Nuclear decommissioning trusts 122 104
Recurring | Other | Private equity and other | DTE Electric    
Assets    
Nuclear decommissioning trusts 122 104
Recurring | Other | Equity securities    
Assets    
Nuclear decommissioning trusts 205 222
Recurring | Other | Equity securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 205 222
Recurring | Other | Fixed income securities    
Assets    
Nuclear decommissioning trusts 86 82
Recurring | Other | Fixed income securities | DTE Electric    
Assets    
Nuclear decommissioning trusts $ 86 $ 82