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Fair Value (Assets and Liabilities Recorded at Fair Value on a Recurring Basis) (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Derivative assets    
Derivative assets, gross $ 2,340 $ 567
Derivative asset, netting (1,912) (411)
Derivative assets, net 428 156
Derivative liabilities    
Derivative liabilities, gross (2,557) (533)
Derivative liability, netting 1,848 405
Derivative liabilities, net (709) (128)
DTE Electric    
Assets    
Nuclear decommissioning trusts 2,007 1,855
Current liabilities    
Derivative liabilities    
Derivative liabilities, gross (2,011) (386)
Noncurrent liabilities    
Derivative liabilities    
Derivative liabilities, gross (546) (147)
Natural gas    
Derivative assets    
Derivative assets, gross 778 233
Derivative asset, netting (715) (156)
Derivative assets, net 63 77
Derivative liabilities    
Derivative liabilities, gross (1,055) (223)
Derivative liability, netting 664 151
Derivative liabilities, net (391) (72)
Electricity    
Derivative assets    
Derivative assets, gross 952 180
Derivative asset, netting (627) (120)
Derivative assets, net 325 60
Derivative liabilities    
Derivative liabilities, gross (916) (168)
Derivative liability, netting 614 125
Derivative liabilities, net (302) (43)
Environmental & Other    
Derivative assets    
Derivative assets, gross 610 154
Derivative asset, netting (570) (135)
Derivative assets, net 40 19
Derivative liabilities    
Derivative liabilities, gross (581) (137)
Derivative liability, netting 570 129
Derivative liabilities, net (11) (8)
Foreign currency exchange contracts    
Derivative liabilities    
Derivative liabilities, gross (5) (5)
Derivative liability, netting 0 0
Derivative liabilities, net (5) (5)
Cash equivalents | DTE Electric    
Assets    
Nuclear decommissioning trusts 34 27
Private equity and other | DTE Electric    
Assets    
Nuclear decommissioning trusts 175 104
Equity securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 1,140 1,169
Fixed income securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 658 555
Recurring    
Assets    
Cash equivalents 9 438
Derivative assets    
Derivative asset, netting (1,912) (411)
Derivative assets, net 428 156
Total assets 2,598 2,609
Derivative liabilities    
Derivative liability, netting 1,848 405
Derivative liabilities, net (709) (128)
Net Assets (Liabilities) at end of period 1,889 2,481
Net Assets at end of period, netting (64) (6)
Recurring | DTE Electric    
Assets    
Cash equivalents 0 4
Derivative assets    
Total assets 2,048 1,890
Recurring | Current assets    
Derivative assets    
Derivative asset, netting (1,591) (330)
Total assets 356 554
Recurring | Current assets | DTE Electric    
Derivative assets    
Total assets 12 8
Recurring | Noncurrent assets    
Derivative assets    
Derivative asset, netting (321) (81)
Total assets 2,242 2,055
Recurring | Noncurrent assets | DTE Electric    
Derivative assets    
Total assets 2,036 1,882
Recurring | Current liabilities    
Derivative liabilities    
Derivative liability, netting 1,546 318
Derivative liabilities, net (465) (68)
Recurring | Noncurrent liabilities    
Derivative liabilities    
Derivative liability, netting 302 87
Derivative liabilities, net (244) (60)
Recurring | Restricted cash    
Assets    
Cash equivalents 1 2
Recurring | Natural gas    
Derivative assets    
Derivative asset, netting (715) (156)
Derivative assets, net 63 77
Derivative liabilities    
Derivative liability, netting 664 151
Derivative liabilities, net (391) (72)
Recurring | Electricity    
Derivative assets    
Derivative asset, netting (627) (120)
Derivative assets, net 325 60
Derivative liabilities    
Derivative liability, netting 614 125
Derivative liabilities, net (302) (43)
Recurring | Environmental & Other    
Derivative assets    
Derivative asset, netting (570) (135)
Derivative assets, net 40 19
Derivative liabilities    
Derivative liability, netting 570 129
Derivative liabilities, net (11) (8)
Recurring | Foreign currency exchange contracts    
Derivative liabilities    
Derivative liability, netting 0 0
Derivative liabilities, net (5) (5)
Recurring | Derivative assets — FTRs | DTE Electric    
Derivative assets    
Derivative assets, net 12 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 175 104
Recurring | Private equity and other | DTE Electric    
Assets    
Nuclear decommissioning trusts 175 104
Recurring | Equity securities    
Assets    
Nuclear decommissioning trusts 1,140 1,169
Other investments 61 55
Recurring | Equity securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 1,140 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 9 438
Derivative assets    
Derivative assets, gross 579 99
Total assets 1,847 1,773
Derivative liabilities    
Derivative liabilities, gross (425) (88)
Net Assets (Liabilities) at end of period 1,422 1,685
Recurring | Level 1 | DTE Electric    
Assets    
Cash equivalents 0 4
Derivative assets    
Total assets 1,134 1,107
Recurring | Level 1 | Current assets    
Derivative assets    
Total assets 506 532
Recurring | Level 1 | Current assets | DTE Electric    
Derivative assets    
Total assets 0 4
Recurring | Level 1 | Noncurrent assets    
Derivative assets    
Total assets 1,341 1,241
Recurring | Level 1 | Noncurrent assets | DTE Electric    
Derivative assets    
Total assets 1,134 1,103
Recurring | Level 1 | Current liabilities    
Derivative liabilities    
Derivative liabilities, gross (409) (84)
Recurring | Level 1 | Noncurrent liabilities    
Derivative liabilities    
Derivative liabilities, gross (16) (4)
Recurring | Level 1 | Natural gas    
Derivative assets    
Derivative assets, gross 579 99
Derivative liabilities    
Derivative liabilities, gross (425) (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 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 944 947
Other investments 61 55
Recurring | Level 1 | Equity securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 944 947
Other investments 18 16
Recurring | Level 1 | Fixed income securities    
Assets    
Nuclear decommissioning trusts 127 102
Other investments 7 8
Recurring | Level 1 | Fixed income securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 127 102
Recurring | Level 2    
Assets    
Cash equivalents 0 0
Derivative assets    
Derivative assets, gross 1,451 352
Total assets 1,880 723
Derivative liabilities    
Derivative liabilities, gross (1,459) (327)
Net Assets (Liabilities) at end of period 421 396
Recurring | Level 2 | DTE Electric    
Assets    
Cash equivalents 0 0
Derivative assets    
Total assets 429 371
Recurring | Level 2 | Current assets    
Derivative assets    
Total assets 1,183 260
Recurring | Level 2 | Current assets | DTE Electric    
Derivative assets    
Total assets 0 0
Recurring | Level 2 | Noncurrent assets    
Derivative assets    
Total assets 697 463
Recurring | Level 2 | Noncurrent assets | DTE Electric    
Derivative assets    
Total assets 429 371
Recurring | Level 2 | Current liabilities    
Derivative liabilities    
Derivative liabilities, gross (1,138) (223)
Recurring | Level 2 | Noncurrent liabilities    
Derivative liabilities    
Derivative liabilities, gross (321) (104)
Recurring | Level 2 | Natural gas    
Derivative assets    
Derivative assets, gross 146 74
Derivative liabilities    
Derivative liabilities, gross (297) (59)
Recurring | Level 2 | Electricity    
Derivative assets    
Derivative assets, gross 707 128
Derivative liabilities    
Derivative liabilities, gross (576) (126)
Recurring | Level 2 | Environmental & Other    
Derivative assets    
Derivative assets, gross 598 150
Derivative liabilities    
Derivative liabilities, gross (581) (137)
Recurring | Level 2 | Foreign currency exchange contracts    
Derivative liabilities    
Derivative liabilities, gross (5) (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 429 371
Other investments 0 0
Recurring | Level 2 | Fixed income securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 429 371
Recurring | Level 3    
Assets    
Cash equivalents 0 0
Derivative assets    
Derivative assets, gross 310 116
Total assets 310 116
Derivative liabilities    
Derivative liabilities, gross (673) (118)
Net Assets (Liabilities) at end of period (363) (2)
Recurring | Level 3 | DTE Electric    
Assets    
Cash equivalents 0 0
Derivative assets    
Total assets 12 4
Recurring | Level 3 | Current assets    
Derivative assets    
Total assets 258 92
Recurring | Level 3 | Current assets | DTE Electric    
Derivative assets    
Total assets 12 4
Recurring | Level 3 | Noncurrent assets    
Derivative assets    
Total assets 52 24
Recurring | Level 3 | Noncurrent assets | DTE Electric    
Derivative assets    
Total assets 0 0
Recurring | Level 3 | Current liabilities    
Derivative liabilities    
Derivative liabilities, gross (464) (79)
Recurring | Level 3 | Noncurrent liabilities    
Derivative liabilities    
Derivative liabilities, gross (209) (39)
Recurring | Level 3 | Natural gas    
Derivative assets    
Derivative assets, gross 53 60
Derivative liabilities    
Derivative liabilities, gross (333) (76)
Recurring | Level 3 | Electricity    
Derivative assets    
Derivative assets, gross 245 52
Derivative liabilities    
Derivative liabilities, gross (340) (42)
Recurring | Level 3 | Environmental & Other    
Derivative assets    
Derivative assets, gross 12 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 12 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 473 408
Derivative liabilities    
Net Assets (Liabilities) at end of period 473 408
Recurring | Other | DTE Electric    
Derivative assets    
Total assets 473 408
Recurring | Other | Noncurrent assets    
Derivative assets    
Total assets 473 408
Recurring | Other | Noncurrent assets | DTE Electric    
Derivative assets    
Total assets 473 408
Recurring | Other | Private equity and other    
Assets    
Nuclear decommissioning trusts 175 104
Recurring | Other | Private equity and other | DTE Electric    
Assets    
Nuclear decommissioning trusts 175 104
Recurring | Other | Equity securities    
Assets    
Nuclear decommissioning trusts 196 222
Recurring | Other | Equity securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 196 222
Recurring | Other | Fixed income securities    
Assets    
Nuclear decommissioning trusts 102 82
Recurring | Other | Fixed income securities | DTE Electric    
Assets    
Nuclear decommissioning trusts $ 102 $ 82