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Fair Value (Assets and Liabilities Recorded at Fair Value on a Recurring Basis) (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Derivative assets    
Derivative assets, gross $ 580 $ 775
Derivative asset, netting (486) (601)
Derivative assets, net 94 174
Derivative liabilities    
Derivative liabilities, gross (564) (770)
Derivative liability, netting 460 601
Derivative liabilities, net (104) (169)
Current liabilities    
Derivative liabilities    
Derivative liabilities, gross (421) (596)
Noncurrent liabilities    
Derivative liabilities    
Derivative liabilities, gross (143) (174)
Natural gas    
Derivative assets    
Derivative assets, gross 240 355
Derivative asset, netting (194) (266)
Derivative assets, net 46 89
Derivative liabilities    
Derivative liabilities, gross (265) (351)
Derivative liability, netting 185 266
Derivative liabilities, net (80) (85)
Electricity    
Derivative assets    
Derivative assets, gross 137 306
Derivative asset, netting (106) (225)
Derivative assets, net 31 81
Derivative liabilities    
Derivative liabilities, gross (126) (298)
Derivative liability, netting 104 225
Derivative liabilities, net (22) (73)
Environmental & Other    
Derivative assets    
Derivative assets, gross 201 113
Derivative asset, netting (186) (110)
Derivative assets, net 15 3
Derivative liabilities    
Derivative liabilities, gross (171) (121)
Derivative liability, netting 171 110
Derivative liabilities, net 0 (11)
Foreign currency exchange contracts    
Derivative assets    
Derivative assets, gross 2 1
Derivative asset, netting 0 0
Derivative assets, net 2 1
Derivative liabilities    
Derivative liabilities, gross (2) 0
Derivative liability, netting 0 0
Derivative liabilities, net (2) 0
Recurring    
Assets    
Cash equivalents 567 15
Derivative assets    
Derivative asset, netting (486) (601)
Derivative assets, net 94 174
Total assets 2,478 2,073
Derivative liabilities    
Derivative liability, netting 460 601
Derivative liabilities, net (104) (169)
Net Assets (Liabilities) at end of period 2,374 1,904
Net Assets at end of period, netting (26) 0
Recurring | DTE Electric    
Assets    
Cash equivalents 175 11
Derivative assets    
Total assets 1,871 1,688
Recurring | Current assets    
Derivative assets    
Derivative asset, netting (379) (513)
Total assets 632 148
Recurring | Current assets | DTE Electric    
Derivative assets    
Total assets 182 14
Recurring | Noncurrent assets    
Derivative assets    
Derivative asset, netting (107) (88)
Total assets 1,846 1,925
Recurring | Noncurrent assets | DTE Electric    
Derivative assets    
Total assets 1,689 1,674
Recurring | Current liabilities    
Derivative liabilities    
Derivative liability, netting 361 513
Derivative liabilities, net (60) (83)
Recurring | Noncurrent liabilities    
Derivative liabilities    
Derivative liability, netting 99 88
Derivative liabilities, net (44) (86)
Recurring | Cash and cash equivalents    
Assets    
Cash equivalents 565 4
Recurring | Cash and cash equivalents | DTE Electric    
Assets    
Cash equivalents 175  
Recurring | Restricted cash    
Assets    
Cash equivalents 2  
Recurring | Other    
Assets    
Cash equivalents   11
Recurring | Other | DTE Electric    
Assets    
Cash equivalents   11
Recurring | Natural gas    
Derivative assets    
Derivative asset, netting (194) (266)
Derivative assets, net 46 89
Derivative liabilities    
Derivative liability, netting 185 266
Derivative liabilities, net (80) (85)
Recurring | Electricity    
Derivative assets    
Derivative asset, netting (106) (225)
Derivative assets, net 31 81
Derivative liabilities    
Derivative liability, netting 104 225
Derivative liabilities, net (22) (73)
Recurring | Environmental & Other    
Derivative assets    
Derivative asset, netting (186) (110)
Derivative assets, net 15 3
Derivative liabilities    
Derivative liability, netting 171 110
Derivative liabilities, net 0 (11)
Recurring | Foreign currency exchange contracts    
Derivative assets    
Derivative asset, netting 0 0
Derivative assets, net 2 1
Derivative liabilities    
Derivative liability, netting 0 0
Derivative liabilities, net (2) 0
Recurring | Derivative assets — FTRs | DTE Electric    
Derivative assets    
Derivative assets, net 7 3
Recurring | Cash equivalents    
Assets    
Nuclear decommissioning trusts 46 34
Other investments 98 4
Recurring | Cash equivalents | DTE Electric    
Assets    
Nuclear decommissioning trusts 46 34
Other investments 11 0
Recurring | Private equity and other    
Assets    
Nuclear decommissioning trusts 78 43
Recurring | Private equity and other | DTE Electric    
Assets    
Nuclear decommissioning trusts 78 43
Recurring | Equity securities    
Assets    
Nuclear decommissioning trusts 1,013 1,046
Other investments 49 140
Recurring | Equity securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 1,013 1,046
Other investments 14 13
Recurring | Fixed income securities    
Assets    
Nuclear decommissioning trusts 527 538
Other investments 6 79
Recurring | Fixed income securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 527 538
Recurring | Level 1    
Assets    
Cash equivalents 567 15
Derivative assets    
Derivative assets, gross 126 205
Total assets 1,886 1,683
Derivative liabilities    
Derivative liabilities, gross (121) (221)
Net Assets (Liabilities) at end of period 1,765 1,462
Recurring | Level 1 | DTE Electric    
Assets    
Cash equivalents 175 11
Derivative assets    
Total assets 1,240 1,264
Recurring | Level 1 | Current assets    
Derivative assets    
Total assets 679 218
Recurring | Level 1 | Current assets | DTE Electric    
Derivative assets    
Total assets 175 11
Recurring | Level 1 | Noncurrent assets    
Derivative assets    
Total assets 1,207 1,465
Recurring | Level 1 | Noncurrent assets | DTE Electric    
Derivative assets    
Total assets 1,065 1,253
Recurring | Level 1 | Current liabilities    
Derivative liabilities    
Derivative liabilities, gross (112) (211)
Recurring | Level 1 | Noncurrent liabilities    
Derivative liabilities    
Derivative liabilities, gross (9) (10)
Recurring | Level 1 | Natural gas    
Derivative assets    
Derivative assets, gross 126 205
Derivative liabilities    
Derivative liabilities, gross (118) (221)
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 (3) 0
Recurring | Level 1 | Foreign currency exchange contracts    
Derivative assets    
Derivative assets, gross 0 0
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 46 34
Other investments 98 4
Recurring | Level 1 | Cash equivalents | DTE Electric    
Assets    
Nuclear decommissioning trusts 46 34
Other investments 11 0
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 872 1,046
Other investments 49 140
Recurring | Level 1 | Equity securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 872 1,046
Other investments 14 13
Recurring | Level 1 | Fixed income securities    
Assets    
Nuclear decommissioning trusts 122 160
Other investments 6 79
Recurring | Level 1 | Fixed income securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 122 160
Recurring | Level 2    
Assets    
Cash equivalents 0 0
Derivative assets    
Derivative assets, gross 371 410
Total assets 696 788
Derivative liabilities    
Derivative liabilities, gross (333) (393)
Net Assets (Liabilities) at end of period 363 395
Recurring | Level 2 | DTE Electric    
Assets    
Cash equivalents 0 0
Derivative assets    
Total assets 325 378
Recurring | Level 2 | Current assets    
Derivative assets    
Total assets 273 320
Recurring | Level 2 | Current assets | DTE Electric    
Derivative assets    
Total assets 0 0
Recurring | Level 2 | Noncurrent assets    
Derivative assets    
Total assets 423 468
Recurring | Level 2 | Noncurrent assets | DTE Electric    
Derivative assets    
Total assets 325 378
Recurring | Level 2 | Current liabilities    
Derivative liabilities    
Derivative liabilities, gross (243) (300)
Recurring | Level 2 | Noncurrent liabilities    
Derivative liabilities    
Derivative liabilities, gross (90) (93)
Recurring | Level 2 | Natural gas    
Derivative assets    
Derivative assets, gross 72 76
Derivative liabilities    
Derivative liabilities, gross (66) (41)
Recurring | Level 2 | Electricity    
Derivative assets    
Derivative assets, gross 103 223
Derivative liabilities    
Derivative liabilities, gross (97) (231)
Recurring | Level 2 | Environmental & Other    
Derivative assets    
Derivative assets, gross 194 110
Derivative liabilities    
Derivative liabilities, gross (168) (121)
Recurring | Level 2 | Foreign currency exchange contracts    
Derivative assets    
Derivative assets, gross 2 1
Derivative liabilities    
Derivative liabilities, gross (2) 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
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 325 378
Other investments 0 0
Recurring | Level 2 | Fixed income securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 325 378
Recurring | Level 3    
Assets    
Cash equivalents 0 0
Derivative assets    
Derivative assets, gross 83 160
Total assets 83 160
Derivative liabilities    
Derivative liabilities, gross (110) (156)
Net Assets (Liabilities) at end of period (27) 4
Recurring | Level 3 | DTE Electric    
Assets    
Cash equivalents 0 0
Derivative assets    
Total assets 7 3
Recurring | Level 3 | Current assets    
Derivative assets    
Total assets 59 123
Recurring | Level 3 | Current assets | DTE Electric    
Derivative assets    
Total assets 7 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    
Derivative liabilities    
Derivative liabilities, gross (66) (85)
Recurring | Level 3 | Noncurrent liabilities    
Derivative liabilities    
Derivative liabilities, gross (44) (71)
Recurring | Level 3 | Natural gas    
Derivative assets    
Derivative assets, gross 42 74
Derivative liabilities    
Derivative liabilities, gross (81) (89)
Recurring | Level 3 | Electricity    
Derivative assets    
Derivative assets, gross 34 83
Derivative liabilities    
Derivative liabilities, gross (29) (67)
Recurring | Level 3 | Environmental & Other    
Derivative assets    
Derivative assets, gross 7 3
Derivative liabilities    
Derivative liabilities, gross 0 0
Recurring | Level 3 | Foreign currency exchange contracts    
Derivative assets    
Derivative assets, gross 0 0
Derivative liabilities    
Derivative liabilities, gross 0 0
Recurring | Level 3 | Derivative assets — FTRs | DTE Electric    
Derivative assets    
Derivative assets, net 7 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
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 299 43
Derivative liabilities    
Net Assets (Liabilities) at end of period 299 43
Recurring | Other | DTE Electric    
Derivative assets    
Total assets 299 43
Recurring | Other | Noncurrent assets    
Derivative assets    
Total assets 299 43
Recurring | Other | Noncurrent assets | DTE Electric    
Derivative assets    
Total assets 299 43
Recurring | Other | Private equity and other    
Assets    
Nuclear decommissioning trusts 78 43
Recurring | Other | Private equity and other | DTE Electric    
Assets    
Nuclear decommissioning trusts 78 $ 43
Recurring | Other | Equity securities    
Assets    
Nuclear decommissioning trusts 141  
Recurring | Other | Equity securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 141  
Recurring | Other | Fixed income securities    
Assets    
Nuclear decommissioning trusts 80  
Recurring | Other | Fixed income securities | DTE Electric    
Assets    
Nuclear decommissioning trusts $ 80