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Fair Value (Assets and Liabilities Recorded at Fair Value on a Recurring Basis) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Derivative assets    
Derivative assets, gross $ 567 $ 775
Derivative assets, netting (411) (601)
Derivative assets, net 156 174
Liabilities    
Derivative liabilities, gross (533) (770)
Derivative liabilities, netting 405 601
Derivative liabilities, net (128) (169)
Current liabilities    
Liabilities    
Derivative liabilities, gross (386) (596)
Noncurrent liabilities    
Liabilities    
Derivative liabilities, gross (147) (174)
Natural Gas    
Derivative assets    
Derivative assets, gross 233 355
Derivative assets, netting (156) (266)
Derivative assets, net 77 89
Liabilities    
Derivative liabilities, gross (223) (351)
Derivative liabilities, netting 151 266
Derivative liabilities, net (72) (85)
Electricity    
Derivative assets    
Derivative assets, gross 180 306
Derivative assets, netting (120) (225)
Derivative assets, net 60 81
Liabilities    
Derivative liabilities, gross (168) (298)
Derivative liabilities, netting 125 225
Derivative liabilities, net (43) (73)
Environmental & Other    
Derivative assets    
Derivative assets, gross 154 113
Derivative assets, netting (135) (110)
Derivative assets, net 19 3
Liabilities    
Derivative liabilities, gross (137) (121)
Derivative liabilities, netting 129 110
Derivative liabilities, net (8) (11)
Foreign currency exchange contracts    
Derivative assets    
Derivative assets, gross 0 1
Derivative assets, netting 0 0
Derivative assets, net 0 1
Liabilities    
Derivative liabilities, gross (5) 0
Derivative liabilities, netting 0 0
Derivative liabilities, net (5) 0
Recurring    
Assets    
Cash equivalents 438 15
Derivative assets    
Derivative assets, netting (411) (601)
Derivative assets, net 156 174
Total assets 2,609 2,073
Liabilities    
Derivative liabilities, netting 405 601
Derivative liabilities, net (128) (169)
Net Assets (Liabilities) at end of period 2,481 1,904
Net Assets (Liabilities) at the end of the period, netting (6) 0
Recurring | DTE Electric    
Assets    
Cash equivalents 4 11
Derivative assets    
Total assets 1,890 1,688
Recurring | Current assets    
Derivative assets    
Derivative assets, netting (330) (513)
Total assets 554 148
Recurring | Current assets | DTE Electric    
Derivative assets    
Total assets 8 14
Recurring | Noncurrent assets    
Derivative assets    
Derivative assets, netting (81) (88)
Total assets 2,055 1,925
Recurring | Noncurrent assets | DTE Electric    
Derivative assets    
Total assets 1,882 1,674
Recurring | Current liabilities    
Liabilities    
Derivative liabilities, netting 318 513
Derivative liabilities, net (68) (83)
Recurring | Noncurrent liabilities    
Liabilities    
Derivative liabilities, netting 87 88
Derivative liabilities, net (60) (86)
Recurring | Cash and Cash equivalents    
Assets    
Cash equivalents 436 4
Recurring | Restricted cash    
Assets    
Cash equivalents 2  
Recurring | Other investments    
Assets    
Cash equivalents   11
Recurring | Natural Gas    
Derivative assets    
Derivative assets, netting (156) (266)
Derivative assets, net 77 89
Liabilities    
Derivative liabilities, netting 151 266
Derivative liabilities, net (72) (85)
Recurring | Electricity    
Derivative assets    
Derivative assets, netting (120) (225)
Derivative assets, net 60 81
Liabilities    
Derivative liabilities, netting 125 225
Derivative liabilities, net (43) (73)
Recurring | Environmental & Other    
Derivative assets    
Derivative assets, netting (135) (110)
Derivative assets, net 19 3
Liabilities    
Derivative liabilities, netting 129 110
Derivative liabilities, net (8) (11)
Recurring | Foreign currency exchange contracts    
Derivative assets    
Derivative assets, netting 0 0
Derivative assets, net 0 1
Liabilities    
Derivative liabilities, netting 0 0
Derivative liabilities, net (5) 0
Recurring | Derivative assets — FTRs | DTE Electric    
Derivative assets    
Derivative assets, net 4 3
Recurring | Cash equivalents    
Assets    
Nuclear decommissioning trusts 27 34
Other investments 97 4
Recurring | Cash equivalents | DTE Electric    
Assets    
Nuclear decommissioning trusts 27 34
Recurring | Private equity and other    
Assets    
Nuclear decommissioning trusts 104 43
Recurring | Private equity and other | DTE Electric    
Assets    
Nuclear decommissioning trusts 104 43
Recurring | Equity securities    
Assets    
Nuclear decommissioning trusts 1,169 1,046
Other investments 55 140
Recurring | Equity securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 1,169 1,046
Other investments 16 13
Recurring | Fixed income securities    
Assets    
Nuclear decommissioning trusts 555 538
Other investments 8 79
Recurring | Fixed income securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 555 538
Other investments 11 0
Recurring | Level 1    
Assets    
Cash equivalents 438 15
Derivative assets    
Derivative assets, gross 99 205
Total assets 1,773 1,683
Liabilities    
Derivative liabilities, gross (88) (221)
Net Assets (Liabilities) at end of period 1,685 1,462
Recurring | Level 1 | DTE Electric    
Assets    
Cash equivalents 4 11
Derivative assets    
Total assets 1,107 1,264
Recurring | Level 1 | Current assets    
Derivative assets    
Total assets 532 218
Recurring | Level 1 | Current assets | DTE Electric    
Derivative assets    
Total assets 4 11
Recurring | Level 1 | Noncurrent assets    
Derivative assets    
Total assets 1,241 1,465
Recurring | Level 1 | Noncurrent assets | DTE Electric    
Derivative assets    
Total assets 1,103 1,253
Recurring | Level 1 | Current liabilities    
Liabilities    
Derivative liabilities, gross (84) (211)
Recurring | Level 1 | Noncurrent liabilities    
Liabilities    
Derivative liabilities, gross (4) (10)
Recurring | Level 1 | Natural Gas    
Derivative assets    
Derivative assets, gross 99 205
Liabilities    
Derivative liabilities, gross (88) (221)
Recurring | Level 1 | Electricity    
Derivative assets    
Derivative assets, gross 0 0
Liabilities    
Derivative liabilities, gross 0 0
Recurring | Level 1 | Environmental & Other    
Derivative assets    
Derivative assets, gross 0 0
Liabilities    
Derivative liabilities, gross 0 0
Recurring | Level 1 | Foreign currency exchange contracts    
Derivative assets    
Derivative assets, gross 0 0
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 27 34
Other investments 97 4
Recurring | Level 1 | Cash equivalents | DTE Electric    
Assets    
Nuclear decommissioning trusts 27 34
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 947 1,046
Other investments 55 140
Recurring | Level 1 | Equity securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 947 1,046
Other investments 16 13
Recurring | Level 1 | Fixed income securities    
Assets    
Nuclear decommissioning trusts 102 160
Other investments 8 79
Recurring | Level 1 | Fixed income securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 102 160
Other investments 11 0
Recurring | Level 2    
Assets    
Cash equivalents 0 0
Derivative assets    
Derivative assets, gross 352 410
Total assets 723 788
Liabilities    
Derivative liabilities, gross (327) (393)
Net Assets (Liabilities) at end of period 396 395
Recurring | Level 2 | DTE Electric    
Assets    
Cash equivalents 0 0
Derivative assets    
Total assets 371 378
Recurring | Level 2 | Current assets    
Derivative assets    
Total assets 260 320
Recurring | Level 2 | Current assets | DTE Electric    
Derivative assets    
Total assets 0 0
Recurring | Level 2 | Noncurrent assets    
Derivative assets    
Total assets 463 468
Recurring | Level 2 | Noncurrent assets | DTE Electric    
Derivative assets    
Total assets 371 378
Recurring | Level 2 | Current liabilities    
Liabilities    
Derivative liabilities, gross (223) (300)
Recurring | Level 2 | Noncurrent liabilities    
Liabilities    
Derivative liabilities, gross (104) (93)
Recurring | Level 2 | Natural Gas    
Derivative assets    
Derivative assets, gross 74 76
Liabilities    
Derivative liabilities, gross (59) (41)
Recurring | Level 2 | Electricity    
Derivative assets    
Derivative assets, gross 128 223
Liabilities    
Derivative liabilities, gross (126) (231)
Recurring | Level 2 | Environmental & Other    
Derivative assets    
Derivative assets, gross 150 110
Liabilities    
Derivative liabilities, gross (137) (121)
Recurring | Level 2 | Foreign currency exchange contracts    
Derivative assets    
Derivative assets, gross 0 1
Liabilities    
Derivative liabilities, gross (5) 0
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
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 371 378
Other investments 0 0
Recurring | Level 2 | Fixed income securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 371 378
Other investments 0 0
Recurring | Level 3    
Assets    
Cash equivalents 0 0
Derivative assets    
Derivative assets, gross 116 160
Total assets 116 160
Liabilities    
Derivative liabilities, gross (118) (156)
Net Assets (Liabilities) at end of period (2) 4
Recurring | Level 3 | DTE Electric    
Assets    
Cash equivalents 0 0
Derivative assets    
Total assets 4 3
Recurring | Level 3 | Current assets    
Derivative assets    
Total assets 92 123
Recurring | Level 3 | Current assets | DTE Electric    
Derivative assets    
Total assets 4 3
Recurring | Level 3 | Noncurrent assets    
Derivative assets    
Total assets 24 37
Recurring | Level 3 | Noncurrent assets | DTE Electric    
Derivative assets    
Total assets 0 0
Recurring | Level 3 | Current liabilities    
Liabilities    
Derivative liabilities, gross (79) (85)
Recurring | Level 3 | Noncurrent liabilities    
Liabilities    
Derivative liabilities, gross (39) (71)
Recurring | Level 3 | Natural Gas    
Derivative assets    
Derivative assets, gross 60 74
Liabilities    
Derivative liabilities, gross (76) (89)
Recurring | Level 3 | Electricity    
Derivative assets    
Derivative assets, gross 52 83
Liabilities    
Derivative liabilities, gross (42) (67)
Recurring | Level 3 | Environmental & Other    
Derivative assets    
Derivative assets, gross 4 3
Liabilities    
Derivative liabilities, gross 0 0
Recurring | Level 3 | Foreign currency exchange contracts    
Derivative assets    
Derivative assets, gross 0 0
Liabilities    
Derivative liabilities, gross 0 0
Recurring | Level 3 | Derivative assets — FTRs | DTE Electric    
Derivative assets    
Derivative assets, net 4 3
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
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
Other investments 0 0
Recurring | Other    
Derivative assets    
Total assets 408 43
Liabilities    
Net Assets (Liabilities) at end of period 408 43
Recurring | Other | DTE Electric    
Derivative assets    
Total assets 408 43
Recurring | Other | Noncurrent assets    
Derivative assets    
Total assets 408 43
Recurring | Other | Noncurrent assets | DTE Electric    
Derivative assets    
Total assets 408 43
Recurring | Other | Private equity and other    
Assets    
Nuclear decommissioning trusts 104 43
Recurring | Other | Private equity and other | DTE Electric    
Assets    
Nuclear decommissioning trusts 104 43
Recurring | Other | Equity securities    
Assets    
Nuclear decommissioning trusts 222 0
Recurring | Other | Equity securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 222 0
Recurring | Other | Fixed income securities    
Assets    
Nuclear decommissioning trusts 82 0
Recurring | Other | Fixed income securities | DTE Electric    
Assets    
Nuclear decommissioning trusts $ 82 $ 0