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Fair Value (Assets and Liabilities Recorded at Fair Value on a Recurring Basis) (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Derivative assets    
Derivative assets, gross $ 442 $ 652
Derivative asset, netting (314) (498)
Derivative assets, net 128 154
Derivative liabilities    
Derivative liabilities, gross (458) (657)
Derivative liability, netting 313 511
Derivative liabilities, net (145) (146)
Current liabilities    
Derivative liabilities    
Derivative liabilities, gross (342) (558)
Noncurrent liabilities    
Derivative liabilities    
Derivative liabilities, gross (116) (99)
Natural gas    
Derivative assets    
Derivative assets, gross 200 357
Derivative asset, netting (139) (256)
Derivative assets, net 61 101
Derivative liabilities    
Derivative liabilities, gross (229) (378)
Derivative liability, netting 139 263
Derivative liabilities, net (90) (115)
Electricity    
Derivative assets    
Derivative assets, gross 234 285
Derivative asset, netting (173) (241)
Derivative assets, net 61 44
Derivative liabilities    
Derivative liabilities, gross (227) (275)
Derivative liability, netting 172 246
Derivative liabilities, net (55) (29)
Other    
Derivative assets    
Derivative assets, gross 7 9
Derivative asset, netting (1) 0
Derivative assets, net 6 9
Derivative liabilities    
Derivative liabilities, gross (1) (1)
Derivative liability, netting 1 1
Derivative liabilities, net 0 0
Foreign currency exchange contracts    
Derivative assets    
Derivative assets, gross 1 1
Derivative asset, netting (1) (1)
Derivative assets, net 0 0
Derivative liabilities    
Derivative liabilities, gross (1) (3)
Derivative liability, netting 1 1
Derivative liabilities, net 0 (2)
Recurring    
Assets    
Cash equivalents 36 19
Derivative assets    
Derivative asset, netting (314) (498)
Derivative assets, net 128 154
Total assets 1,887 1,859
Derivative liabilities    
Derivative liability, netting 313 511
Derivative liabilities, net (145) (146)
Net Assets (Liabilities) at end of period 1,742 1,713
Net Assets (Liabilities) at end of period, netting (1) 13
Recurring | DTE Electric    
Assets    
Cash equivalents 11 11
Derivative assets    
Total assets 1,554 1,523
Recurring | Current assets    
Derivative assets    
Derivative asset, netting (264) (437)
Total assets 133 122
Recurring | Current assets | DTE Electric    
Derivative assets    
Total assets 17 20
Recurring | Noncurrent assets    
Derivative assets    
Derivative asset, netting (50) (61)
Total assets 1,754 1,737
Recurring | Noncurrent assets | DTE Electric    
Derivative assets    
Total assets 1,537 1,503
Recurring | Current liabilities    
Derivative liabilities    
Derivative liability, netting 263 459
Derivative liabilities, net (79) (99)
Recurring | Noncurrent liabilities    
Derivative liabilities    
Derivative liability, netting 50 52
Derivative liabilities, net (66) (47)
Recurring | Cash and Cash equivalents    
Assets    
Cash equivalents 21  
Recurring | Restricted cash    
Assets    
Cash equivalents 4 8
Recurring | Other investments    
Assets    
Cash equivalents 11 11
Recurring | Other investments | DTE Electric    
Assets    
Cash equivalents 11 11
Recurring | Natural gas    
Derivative assets    
Derivative asset, netting (139) (256)
Derivative assets, net 61 101
Derivative liabilities    
Derivative liability, netting 139 263
Derivative liabilities, net (90) (115)
Recurring | Electricity    
Derivative assets    
Derivative asset, netting (173) (241)
Derivative assets, net 61 44
Derivative liabilities    
Derivative liability, netting 172 246
Derivative liabilities, net (55) (29)
Recurring | Other    
Derivative assets    
Derivative asset, netting (1) 0
Derivative assets, net 6 9
Derivative liabilities    
Derivative liability, netting 1 1
Derivative liabilities, net 0 0
Recurring | Foreign currency exchange contracts    
Derivative assets    
Derivative asset, netting (1) (1)
Derivative assets, net 0 0
Derivative liabilities    
Derivative liability, netting 1 1
Derivative liabilities, net 0 (2)
Recurring | Derivative assets — FTRs | DTE Electric    
Derivative assets    
Derivative assets, net 6 9
Recurring | Cash equivalents    
Assets    
Nuclear decommissioning trusts 17 14
Other investments 4 4
Recurring | Cash equivalents | DTE Electric    
Assets    
Nuclear decommissioning trusts 17 14
Recurring | Private equity securities    
Assets    
Nuclear decommissioning trusts 11 5
Recurring | Private equity securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 11 5
Recurring | Equity securities    
Assets    
Nuclear decommissioning trusts 973 978
Other investments 125 118
Recurring | Equity securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 973 978
Other investments 12 11
Recurring | Fixed income securities    
Assets    
Nuclear decommissioning trusts 524 495
Other investments 69 72
Recurring | Fixed income securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 524 495
Recurring | Level 1    
Assets    
Cash equivalents 33 16
Derivative assets    
Derivative assets, gross 76 148
Total assets 1,302 1,368
Derivative liabilities    
Derivative liabilities, gross (70) (141)
Net Assets (Liabilities) at end of period 1,232 1,227
Recurring | Level 1 | DTE Electric    
Assets    
Cash equivalents 8 8
Derivative assets    
Total assets 1,015 1,029
Recurring | Level 1 | Current assets    
Derivative assets    
Total assets 108 157
Recurring | Level 1 | Current assets | DTE Electric    
Derivative assets    
Total assets 8 8
Recurring | Level 1 | Noncurrent assets    
Derivative assets    
Total assets 1,194 1,211
Recurring | Level 1 | Noncurrent assets | DTE Electric    
Derivative assets    
Total assets 1,007 1,021
Recurring | Level 1 | Current liabilities    
Derivative liabilities    
Derivative liabilities, gross (62) (137)
Recurring | Level 1 | Noncurrent liabilities    
Derivative liabilities    
Derivative liabilities, gross (8) (4)
Recurring | Level 1 | Natural gas    
Derivative assets    
Derivative assets, gross 75 148
Derivative liabilities    
Derivative liabilities, gross (69) (141)
Recurring | Level 1 | Electricity    
Derivative assets    
Derivative assets, gross 0 0
Derivative liabilities    
Derivative liabilities, gross 0 0
Recurring | Level 1 | Other    
Derivative assets    
Derivative assets, gross 1 0
Derivative liabilities    
Derivative liabilities, gross (1) 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 17 14
Other investments 4 4
Recurring | Level 1 | Cash equivalents | DTE Electric    
Assets    
Nuclear decommissioning trusts 17 14
Recurring | Level 1 | Private equity securities    
Assets    
Nuclear decommissioning trusts 0 0
Recurring | Level 1 | Private equity securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 0 0
Recurring | Level 1 | Equity securities    
Assets    
Nuclear decommissioning trusts 973 978
Other investments 125 118
Recurring | Level 1 | Equity securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 973 978
Other investments 12 11
Recurring | Level 1 | Fixed income securities    
Assets    
Nuclear decommissioning trusts 5 18
Other investments 69 72
Recurring | Level 1 | Fixed income securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 5 18
Recurring | Level 2    
Assets    
Cash equivalents 3 3
Derivative assets    
Derivative assets, gross 263 356
Total assets 785 836
Derivative liabilities    
Derivative liabilities, gross (235) (359)
Net Assets (Liabilities) at end of period 550 477
Recurring | Level 2 | DTE Electric    
Assets    
Cash equivalents 3 3
Derivative assets    
Total assets 522 480
Recurring | Level 2 | Current assets    
Derivative assets    
Total assets 213 298
Recurring | Level 2 | Current assets | DTE Electric    
Derivative assets    
Total assets 3 3
Recurring | Level 2 | Noncurrent assets    
Derivative assets    
Total assets 572 538
Recurring | Level 2 | Noncurrent assets | DTE Electric    
Derivative assets    
Total assets 519 477
Recurring | Level 2 | Current liabilities    
Derivative liabilities    
Derivative liabilities, gross (194) (313)
Recurring | Level 2 | Noncurrent liabilities    
Derivative liabilities    
Derivative liabilities, gross (41) (46)
Recurring | Level 2 | Natural gas    
Derivative assets    
Derivative assets, gross 72 112
Derivative liabilities    
Derivative liabilities, gross (61) (111)
Recurring | Level 2 | Electricity    
Derivative assets    
Derivative assets, gross 190 243
Derivative liabilities    
Derivative liabilities, gross (173) (245)
Recurring | Level 2 | Other    
Derivative assets    
Derivative assets, gross 0 0
Derivative liabilities    
Derivative liabilities, gross 0 0
Recurring | Level 2 | Foreign currency exchange contracts    
Derivative assets    
Derivative assets, gross 1 1
Derivative liabilities    
Derivative liabilities, gross (1) (3)
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 securities    
Assets    
Nuclear decommissioning trusts 0 0
Recurring | Level 2 | Private equity securities | 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 519 477
Other investments 0 0
Recurring | Level 2 | Fixed income securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 519 477
Recurring | Level 3    
Assets    
Cash equivalents 0 0
Derivative assets    
Derivative assets, gross 103 148
Total assets 103 148
Derivative liabilities    
Derivative liabilities, gross (153) (157)
Net Assets (Liabilities) at end of period (50) (9)
Recurring | Level 3 | DTE Electric    
Assets    
Cash equivalents 0 0
Derivative assets    
Total assets 6 9
Recurring | Level 3 | Current assets    
Derivative assets    
Total assets 76 104
Recurring | Level 3 | Current assets | DTE Electric    
Derivative assets    
Total assets 6 9
Recurring | Level 3 | Noncurrent assets    
Derivative assets    
Total assets 27 44
Recurring | Level 3 | Noncurrent assets | DTE Electric    
Derivative assets    
Total assets 0 0
Recurring | Level 3 | Current liabilities    
Derivative liabilities    
Derivative liabilities, gross (86) (108)
Recurring | Level 3 | Noncurrent liabilities    
Derivative liabilities    
Derivative liabilities, gross (67) (49)
Recurring | Level 3 | Natural gas    
Derivative assets    
Derivative assets, gross 53 97
Derivative liabilities    
Derivative liabilities, gross (99) (126)
Recurring | Level 3 | Electricity    
Derivative assets    
Derivative assets, gross 44 42
Derivative liabilities    
Derivative liabilities, gross (54) (30)
Recurring | Level 3 | Other    
Derivative assets    
Derivative assets, gross 6 9
Derivative liabilities    
Derivative liabilities, gross 0 (1)
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 6 9
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 securities    
Assets    
Nuclear decommissioning trusts 0 0
Recurring | Level 3 | Private equity securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 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 11 5
Derivative liabilities    
Net Assets (Liabilities) at end of period 11 5
Recurring | Other | DTE Electric    
Derivative assets    
Total assets 11 5
Recurring | Other | Noncurrent assets    
Derivative assets    
Total assets 11 5
Recurring | Other | Noncurrent assets | DTE Electric    
Derivative assets    
Total assets 11 5
Recurring | Other | Private equity securities    
Assets    
Nuclear decommissioning trusts 11 5
Recurring | Other | Private equity securities | DTE Electric    
Assets    
Nuclear decommissioning trusts $ 11 $ 5