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Fair Value (Assets and Liabilities Recorded at Fair Value on a Recurring Basis) (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Derivative assets    
Derivative assets, gross $ 703 $ 775
Derivative asset, netting (555) (601)
Derivative assets, net 148 174
Derivative liabilities    
Derivative liabilities, gross (640) (770)
Derivative liability, netting 555 601
Derivative liabilities, net (85) (169)
Current liabilities    
Derivative liabilities    
Derivative liabilities, gross (478) (596)
Noncurrent liabilities    
Derivative liabilities    
Derivative liabilities, gross (162) (174)
Natural gas    
Derivative assets    
Derivative assets, gross 250 355
Derivative asset, netting (173) (266)
Derivative assets, net 77 89
Derivative liabilities    
Derivative liabilities, gross (226) (351)
Derivative liability, netting 173 266
Derivative liabilities, net (53) (85)
Electricity    
Derivative assets    
Derivative assets, gross 223 306
Derivative asset, netting (165) (225)
Derivative assets, net 58 81
Derivative liabilities    
Derivative liabilities, gross (211) (298)
Derivative liability, netting 165 225
Derivative liabilities, net (46) (73)
Environmental & Other    
Derivative assets    
Derivative assets, gross 227 113
Derivative asset, netting (217) (110)
Derivative assets, net 10 3
Derivative liabilities    
Derivative liabilities, gross (202) (121)
Derivative liability, netting 217 110
Derivative liabilities, net 15 (11)
Foreign currency exchange contracts    
Derivative assets    
Derivative assets, gross 3 1
Derivative asset, netting 0 0
Derivative assets, net 3 1
Derivative liabilities    
Derivative liabilities, gross (1) 0
Derivative liability, netting 0 0
Derivative liabilities, net (1) 0
Recurring    
Assets    
Cash equivalents 331 15
Derivative assets    
Derivative asset, netting (555) (601)
Derivative assets, net 148 174
Total assets 2,307 2,073
Derivative liabilities    
Derivative liability, netting 555 601
Derivative liabilities, net (85) (169)
Net Assets at end of period 2,222 1,904
Net Assets at end of period, netting 0 0
Recurring | DTE Electric    
Assets    
Cash equivalents 205 11
Derivative assets    
Total assets 1,842 1,688
Recurring | Current assets    
Derivative assets    
Derivative asset, netting (426) (513)
Total assets 436 148
Recurring | Current assets | DTE Electric    
Derivative assets    
Total assets 215 14
Recurring | Noncurrent assets    
Derivative assets    
Derivative asset, netting (129) (88)
Total assets 1,871 1,925
Recurring | Noncurrent assets | DTE Electric    
Derivative assets    
Total assets 1,627 1,674
Recurring | Current liabilities    
Derivative liabilities    
Derivative liability, netting 426 513
Derivative liabilities, net (52) (83)
Recurring | Noncurrent liabilities    
Derivative liabilities    
Derivative liability, netting 129 88
Derivative liabilities, net (33) (86)
Recurring | Cash and cash equivalents    
Assets    
Cash equivalents 330 4
Recurring | Cash and cash equivalents | DTE Electric    
Assets    
Cash equivalents 205  
Recurring | Restricted cash    
Assets    
Cash equivalents 1  
Recurring | Other    
Assets    
Cash equivalents   11
Recurring | Other | DTE Electric    
Assets    
Cash equivalents   11
Recurring | Natural gas    
Derivative assets    
Derivative asset, netting (173) (266)
Derivative assets, net 77 89
Derivative liabilities    
Derivative liability, netting 173 266
Derivative liabilities, net (53) (85)
Recurring | Electricity    
Derivative assets    
Derivative asset, netting (165) (225)
Derivative assets, net 58 81
Derivative liabilities    
Derivative liability, netting 165 225
Derivative liabilities, net (46) (73)
Recurring | Environmental & Other    
Derivative assets    
Derivative asset, netting (217) (110)
Derivative assets, net 10 3
Derivative liabilities    
Derivative liability, netting 217 110
Derivative liabilities, net 15 (11)
Recurring | Foreign currency exchange contracts    
Derivative assets    
Derivative asset, netting 0 0
Derivative assets, net 3 1
Derivative liabilities    
Derivative liability, netting 0 0
Derivative liabilities, net (1) 0
Recurring | Derivative assets — FTRs | DTE Electric    
Derivative assets    
Derivative assets, net 10 3
Recurring | Cash equivalents    
Assets    
Nuclear decommissioning trusts 59 34
Other investments 177 4
Recurring | Cash equivalents | DTE Electric    
Assets    
Nuclear decommissioning trusts 59 34
Other investments 11 0
Recurring | Private equity and other    
Assets    
Nuclear decommissioning trusts 62 43
Recurring | Private equity and other | DTE Electric    
Assets    
Nuclear decommissioning trusts 62 43
Recurring | Equity securities    
Assets    
Nuclear decommissioning trusts 973 1,046
Other investments 42 140
Recurring | Equity securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 973 1,046
Other investments 13 13
Recurring | Fixed income securities    
Assets    
Nuclear decommissioning trusts 509 538
Other investments 6 79
Recurring | Fixed income securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 509 538
Recurring | Level 1    
Assets    
Cash equivalents 331 15
Derivative assets    
Derivative assets, gross 100 205
Total assets 1,825 1,683
Derivative liabilities    
Derivative liabilities, gross (126) (221)
Net Assets at end of period 1,699 1,462
Recurring | Level 1 | DTE Electric    
Assets    
Cash equivalents 205 11
Derivative assets    
Total assets 1,398 1,264
Recurring | Level 1 | Current assets    
Derivative assets    
Total assets 425 218
Recurring | Level 1 | Current assets | DTE Electric    
Derivative assets    
Total assets 205 11
Recurring | Level 1 | Noncurrent assets    
Derivative assets    
Total assets 1,400 1,465
Recurring | Level 1 | Noncurrent assets | DTE Electric    
Derivative assets    
Total assets 1,193 1,253
Recurring | Level 1 | Current liabilities    
Derivative liabilities    
Derivative liabilities, gross (117) (211)
Recurring | Level 1 | Noncurrent liabilities    
Derivative liabilities    
Derivative liabilities, gross (9) (10)
Recurring | Level 1 | Natural gas    
Derivative assets    
Derivative assets, gross 100 205
Derivative liabilities    
Derivative liabilities, gross (123) (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 59 34
Other investments 177 4
Recurring | Level 1 | Cash equivalents | DTE Electric    
Assets    
Nuclear decommissioning trusts 59 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 973 1,046
Other investments 42 140
Recurring | Level 1 | Equity securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 973 1,046
Other investments 13 13
Recurring | Level 1 | Fixed income securities    
Assets    
Nuclear decommissioning trusts 137 160
Other investments 6 79
Recurring | Level 1 | Fixed income securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 137 160
Recurring | Level 2    
Assets    
Cash equivalents 0 0
Derivative assets    
Derivative assets, gross 454 410
Total assets 826 788
Derivative liabilities    
Derivative liabilities, gross (411) (393)
Net Assets at end of period 415 395
Recurring | Level 2 | DTE Electric    
Assets    
Cash equivalents 0 0
Derivative assets    
Total assets 372 378
Recurring | Level 2 | Current assets    
Derivative assets    
Total assets 329 320
Recurring | Level 2 | Current assets | DTE Electric    
Derivative assets    
Total assets 0 0
Recurring | Level 2 | Noncurrent assets    
Derivative assets    
Total assets 497 468
Recurring | Level 2 | Noncurrent assets | DTE Electric    
Derivative assets    
Total assets 372 378
Recurring | Level 2 | Current liabilities    
Derivative liabilities    
Derivative liabilities, gross (298) (300)
Recurring | Level 2 | Noncurrent liabilities    
Derivative liabilities    
Derivative liabilities, gross (113) (93)
Recurring | Level 2 | Natural gas    
Derivative assets    
Derivative assets, gross 79 76
Derivative liabilities    
Derivative liabilities, gross (52) (41)
Recurring | Level 2 | Electricity    
Derivative assets    
Derivative assets, gross 155 223
Derivative liabilities    
Derivative liabilities, gross (159) (231)
Recurring | Level 2 | Environmental & Other    
Derivative assets    
Derivative assets, gross 217 110
Derivative liabilities    
Derivative liabilities, gross (199) (121)
Recurring | Level 2 | Foreign currency exchange contracts    
Derivative assets    
Derivative assets, gross 3 1
Derivative liabilities    
Derivative liabilities, gross (1) 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 372 378
Other investments 0 0
Recurring | Level 2 | Fixed income securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 372 378
Recurring | Level 3    
Assets    
Cash equivalents 0 0
Derivative assets    
Derivative assets, gross 149 160
Total assets 149 160
Derivative liabilities    
Derivative liabilities, gross (103) (156)
Net Assets at end of period 46 4
Recurring | Level 3 | DTE Electric    
Assets    
Cash equivalents 0 0
Derivative assets    
Total assets 10 3
Recurring | Level 3 | Current assets    
Derivative assets    
Total assets 108 123
Recurring | Level 3 | Current assets | DTE Electric    
Derivative assets    
Total assets 10 3
Recurring | Level 3 | Noncurrent assets    
Derivative assets    
Total assets 41 37
Recurring | Level 3 | Noncurrent assets | DTE Electric    
Derivative assets    
Total assets 0 0
Recurring | Level 3 | Current liabilities    
Derivative liabilities    
Derivative liabilities, gross (63) (85)
Recurring | Level 3 | Noncurrent liabilities    
Derivative liabilities    
Derivative liabilities, gross (40) (71)
Recurring | Level 3 | Natural gas    
Derivative assets    
Derivative assets, gross 71 74
Derivative liabilities    
Derivative liabilities, gross (51) (89)
Recurring | Level 3 | Electricity    
Derivative assets    
Derivative assets, gross 68 83
Derivative liabilities    
Derivative liabilities, gross (52) (67)
Recurring | Level 3 | Environmental & Other    
Derivative assets    
Derivative assets, gross 10 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 10 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 62 43
Derivative liabilities    
Net Assets at end of period 62 43
Recurring | Other | DTE Electric    
Derivative assets    
Total assets 62 43
Recurring | Other | Noncurrent assets    
Derivative assets    
Total assets 62 43
Recurring | Other | Noncurrent assets | DTE Electric    
Derivative assets    
Total assets 62 43
Recurring | Other | Private equity and other    
Assets    
Nuclear decommissioning trusts 62 43
Recurring | Other | Private equity and other | DTE Electric    
Assets    
Nuclear decommissioning trusts $ 62 $ 43