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Fair Value (Assets and Liabilities Recorded at Fair Value on a Recurring Basis) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Derivative assets    
Derivative assets, gross $ 663 $ 652
Derivative assets, netting (530) (498)
Derivative assets, net 133 154
Liabilities    
Derivative liabilities, gross (669) (657)
Derivative liabilities, netting 513 511
Derivative liabilities, net (156) (146)
Current liabilities    
Liabilities    
Derivative liabilities, gross (518) (558)
Noncurrent liabilities    
Liabilities    
Derivative liabilities, gross (151) (99)
Natural Gas    
Derivative assets    
Derivative assets, gross 349 357
Derivative assets, netting (277) (256)
Derivative assets, net 72 101
Liabilities    
Derivative liabilities, gross (380) (378)
Derivative liabilities, netting 272 263
Derivative liabilities, net (108) (115)
Electricity    
Derivative assets    
Derivative assets, gross 303 285
Derivative assets, netting (252) (241)
Derivative assets, net 51 44
Liabilities    
Derivative liabilities, gross (285) (275)
Derivative liabilities, netting 240 246
Derivative liabilities, net (45) (29)
Other    
Derivative assets    
Derivative assets, gross 7 9
Derivative assets, netting (1) 0
Derivative assets, net 6 9
Liabilities    
Derivative liabilities, gross (1) (1)
Derivative liabilities, netting 1 1
Derivative liabilities, net 0 0
Interest rate contracts    
Liabilities    
Derivative liabilities, gross (3) 0
Derivative liabilities, netting 0 0
Derivative liabilities, net (3) 0
Foreign currency exchange contracts    
Derivative assets    
Derivative assets, gross 4 1
Derivative assets, netting 0 (1)
Derivative assets, net 4 0
Liabilities    
Derivative liabilities, gross 0 (3)
Derivative liabilities, netting 0 1
Derivative liabilities, net 0 (2)
Recurring    
Assets    
Cash equivalents 18 19
Derivative assets    
Derivative assets, netting (530) (498)
Derivative assets, net 133 154
Total assets 1,712 1,859
Liabilities    
Derivative liabilities, netting 513 511
Derivative liabilities, net (156) (146)
Net Assets (Liabilities) at end of period 1,556 1,713
Net Assets (Liabilities) at the end of the period, netting (17) 13
Recurring | DTE Electric    
Assets    
Cash equivalents 10 11
Derivative assets    
Total assets 1,404 1,523
Recurring | Current assets    
Derivative assets    
Derivative assets, netting (461) (437)
Total assets 120 122
Recurring | Current assets | DTE Electric    
Derivative assets    
Total assets 16 20
Recurring | Noncurrent assets    
Derivative assets    
Derivative assets, netting (69) (61)
Total assets 1,592 1,737
Recurring | Noncurrent assets | DTE Electric    
Derivative assets    
Total assets 1,388 1,503
Recurring | Current liabilities    
Liabilities    
Derivative liabilities, netting 451 459
Derivative liabilities, net (67) (99)
Recurring | Noncurrent liabilities    
Liabilities    
Derivative liabilities, netting 62 52
Derivative liabilities, net (89) (47)
Recurring | Cash and Cash equivalents    
Assets    
Cash equivalents 3  
Recurring | Restricted cash    
Assets    
Cash equivalents 5 8
Recurring | Other    
Assets    
Cash equivalents 10 11
Recurring | Other | DTE Electric    
Assets    
Cash equivalents 10 11
Recurring | Natural Gas    
Derivative assets    
Derivative assets, netting (277) (256)
Derivative assets, net 72 101
Liabilities    
Derivative liabilities, netting 272 263
Derivative liabilities, net (108) (115)
Recurring | Electricity    
Derivative assets    
Derivative assets, netting (252) (241)
Derivative assets, net 51 44
Liabilities    
Derivative liabilities, netting 240 246
Derivative liabilities, net (45) (29)
Recurring | Other    
Derivative assets    
Derivative assets, netting (1) 0
Derivative assets, net 6 9
Liabilities    
Derivative liabilities, netting 1 1
Derivative liabilities, net 0 0
Recurring | Interest rate contracts    
Liabilities    
Derivative liabilities, netting 0 0
Derivative liabilities, net (3) 0
Recurring | Foreign currency exchange contracts    
Derivative assets    
Derivative assets, netting 0 (1)
Derivative assets, net 4 0
Liabilities    
Derivative liabilities, netting 0 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 5 14
Other investments 4 4
Recurring | Cash equivalents | DTE Electric    
Assets    
Nuclear decommissioning trusts 5 14
Recurring | Private equity and other    
Assets    
Nuclear decommissioning trusts 20 5
Recurring | Private equity and other | DTE Electric    
Assets    
Nuclear decommissioning trusts 20 5
Recurring | Equity securities    
Assets    
Nuclear decommissioning trusts 851 978
Other investments 110 118
Recurring | Equity securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 851 978
Other investments 10 11
Recurring | Fixed income securities    
Assets    
Nuclear decommissioning trusts 502 495
Other investments 69 72
Recurring | Fixed income securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 502 495
Recurring | Level 1    
Assets    
Cash equivalents 16 16
Derivative assets    
Derivative assets, gross 199 148
Total assets 1,266 1,368
Liabilities    
Derivative liabilities, gross (197) (141)
Net Assets (Liabilities) at end of period 1,069 1,227
Recurring | Level 1 | DTE Electric    
Assets    
Cash equivalents 8 8
Derivative assets    
Total assets 886 1,029
Recurring | Level 1 | Current assets    
Derivative assets    
Total assets 212 157
Recurring | Level 1 | Current assets | DTE Electric    
Derivative assets    
Total assets 8 8
Recurring | Level 1 | Noncurrent assets    
Derivative assets    
Total assets 1,054 1,211
Recurring | Level 1 | Noncurrent assets | DTE Electric    
Derivative assets    
Total assets 878 1,021
Recurring | Level 1 | Current liabilities    
Liabilities    
Derivative liabilities, gross (191) (137)
Recurring | Level 1 | Noncurrent liabilities    
Liabilities    
Derivative liabilities, gross (6) (4)
Recurring | Level 1 | Natural Gas    
Derivative assets    
Derivative assets, gross 199 148
Liabilities    
Derivative liabilities, gross (197) (141)
Recurring | Level 1 | Electricity    
Derivative assets    
Derivative assets, gross 0 0
Liabilities    
Derivative liabilities, gross 0 0
Recurring | Level 1 | Other    
Derivative assets    
Derivative assets, gross 0 0
Liabilities    
Derivative liabilities, gross 0 0
Recurring | Level 1 | Interest rate contracts    
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 5 14
Other investments 4 4
Recurring | Level 1 | Cash equivalents | DTE Electric    
Assets    
Nuclear decommissioning trusts 5 14
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 851 978
Other investments 110 118
Recurring | Level 1 | Equity securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 851 978
Other investments 10 11
Recurring | Level 1 | Fixed income securities    
Assets    
Nuclear decommissioning trusts 12 18
Other investments 69 72
Recurring | Level 1 | Fixed income securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 12 18
Recurring | Level 2    
Assets    
Cash equivalents 2 3
Derivative assets    
Derivative assets, gross 338 356
Total assets 830 836
Liabilities    
Derivative liabilities, gross (302) (359)
Net Assets (Liabilities) at end of period 528 477
Recurring | Level 2 | DTE Electric    
Assets    
Cash equivalents 2 3
Derivative assets    
Total assets 492 480
Recurring | Level 2 | Current assets    
Derivative assets    
Total assets 273 298
Recurring | Level 2 | Current assets | DTE Electric    
Derivative assets    
Total assets 2 3
Recurring | Level 2 | Noncurrent assets    
Derivative assets    
Total assets 557 538
Recurring | Level 2 | Noncurrent assets | DTE Electric    
Derivative assets    
Total assets 490 477
Recurring | Level 2 | Current liabilities    
Liabilities    
Derivative liabilities, gross (251) (313)
Recurring | Level 2 | Noncurrent liabilities    
Liabilities    
Derivative liabilities, gross (51) (46)
Recurring | Level 2 | Natural Gas    
Derivative assets    
Derivative assets, gross 87 112
Liabilities    
Derivative liabilities, gross (71) (111)
Recurring | Level 2 | Electricity    
Derivative assets    
Derivative assets, gross 247 243
Liabilities    
Derivative liabilities, gross (227) (245)
Recurring | Level 2 | Other    
Derivative assets    
Derivative assets, gross 0 0
Liabilities    
Derivative liabilities, gross (1) 0
Recurring | Level 2 | Interest rate contracts    
Liabilities    
Derivative liabilities, gross (3) 0
Recurring | Level 2 | Foreign currency exchange contracts    
Derivative assets    
Derivative assets, gross 4 1
Liabilities    
Derivative liabilities, gross 0 (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 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 490 477
Other investments 0 0
Recurring | Level 2 | Fixed income securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 490 477
Recurring | Level 3    
Assets    
Cash equivalents 0 0
Derivative assets    
Derivative assets, gross 126 148
Total assets 126 148
Liabilities    
Derivative liabilities, gross (170) (157)
Net Assets (Liabilities) at end of period (44) (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 96 104
Recurring | Level 3 | Current assets | DTE Electric    
Derivative assets    
Total assets 6 9
Recurring | Level 3 | Noncurrent assets    
Derivative assets    
Total assets 30 44
Recurring | Level 3 | Noncurrent assets | DTE Electric    
Derivative assets    
Total assets 0 0
Recurring | Level 3 | Current liabilities    
Liabilities    
Derivative liabilities, gross (76) (108)
Recurring | Level 3 | Noncurrent liabilities    
Liabilities    
Derivative liabilities, gross (94) (49)
Recurring | Level 3 | Natural Gas    
Derivative assets    
Derivative assets, gross 63 97
Liabilities    
Derivative liabilities, gross (112) (126)
Recurring | Level 3 | Electricity    
Derivative assets    
Derivative assets, gross 56 42
Liabilities    
Derivative liabilities, gross (58) (30)
Recurring | Level 3 | Other    
Derivative assets    
Derivative assets, gross 7 9
Liabilities    
Derivative liabilities, gross 0 (1)
Recurring | Level 3 | Interest rate contracts    
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 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 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 20 5
Liabilities    
Net Assets (Liabilities) at end of period 20 5
Recurring | Other | DTE Electric    
Derivative assets    
Total assets 20 5
Recurring | Other | Noncurrent assets    
Derivative assets    
Total assets 20 5
Recurring | Other | Noncurrent assets | DTE Electric    
Derivative assets    
Total assets 20 5
Recurring | Other | Private equity and other    
Assets    
Nuclear decommissioning trusts 20 5
Recurring | Other | Private equity and other | DTE Electric    
Assets    
Nuclear decommissioning trusts $ 20 $ 5