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Fair Value (Assets and Liabilities Recorded at Fair Value on a Recurring Basis) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Derivative assets    
Derivative assets, gross $ 652 $ 549
Derivative assets, netting (498) (468)
Derivative assets, net 154 81
LIABILITIES    
Derivative liabilities, gross (657) (656)
Derivative liabilities, netting 511 489
Derivative liabilities, net (146) (167)
Current liabilities    
LIABILITIES    
Derivative liabilities, gross (558) (493)
Noncurrent liabilities    
LIABILITIES    
Derivative liabilities, gross (99) (163)
Natural Gas    
Derivative assets    
Derivative assets, gross 357 348
Derivative assets, netting (256) (306)
Derivative assets, net 101 42
LIABILITIES    
Derivative liabilities, gross (378) (461)
Derivative liabilities, netting 263 321
Derivative liabilities, net (115) (140)
Electricity    
Derivative assets    
Derivative assets, gross 285 193
Derivative assets, netting (241) (157)
Derivative assets, net 44 36
LIABILITIES    
Derivative liabilities, gross (275) (189)
Derivative liabilities, netting 246 163
Derivative liabilities, net (29) (26)
Other    
Derivative assets    
Derivative assets, gross 9 2
Derivative assets, netting 0 0
Derivative assets, net 9 2
LIABILITIES    
Derivative liabilities, gross (1) (3)
Derivative liabilities, netting 1 2
Derivative liabilities, net 0 (1)
Foreign currency exchange contracts    
Derivative assets    
Derivative assets, gross 1 6
Derivative assets, netting (1) (5)
Derivative assets, net 0 1
LIABILITIES    
Derivative liabilities, gross (3) (3)
Derivative liabilities, netting 1 3
Derivative liabilities, net (2) 0
Recurring    
ASSETS    
Cash and cash equivalents 19 17
Derivative assets    
Derivative assets, netting (498) (468)
Derivative assets, net 154 81
Total assets 1,859 1,583
Private equity securities 5  
LIABILITIES    
Derivative liabilities, netting 511 489
Derivative liabilities, net (146) (167)
Net Assets (Liabilities) at end of period 1,713 1,416
Net Assets (Liabilities) at the end of the period, netting 13 21
Recurring | DTE Electric    
ASSETS    
Cash and cash equivalents 11 11
Derivative assets    
Total assets 1,523 1,342
Private equity securities 5  
Recurring | Current asset    
Derivative assets    
Derivative assets, netting (437) (400)
Total assets 122 64
Recurring | Current asset | DTE Electric    
Derivative assets    
Total assets 20 13
Recurring | Noncurrent asset    
Derivative assets    
Derivative assets, netting (61) (68)
Total assets 1,737 1,519
Private equity securities 5  
Recurring | Noncurrent asset | DTE Electric    
Derivative assets    
Total assets 1,503 1,329
Private equity securities 5  
Recurring | Current liabilities    
LIABILITIES    
Derivative liabilities, netting 459 424
Derivative liabilities, net (99) (69)
Recurring | Noncurrent liabilities    
LIABILITIES    
Derivative liabilities, netting 52 65
Derivative liabilities, net (47) (98)
Recurring | Restricted assets    
ASSETS    
Cash and cash equivalents 8 7
Recurring | Other    
ASSETS    
Cash and cash equivalents 11 10
Recurring | Other | DTE Electric    
ASSETS    
Cash and cash equivalents 11 11
Recurring | Natural Gas    
Derivative assets    
Derivative assets, netting (256) (306)
Derivative assets, net 101 42
LIABILITIES    
Derivative liabilities, netting 263 321
Derivative liabilities, net (115) (140)
Recurring | Electricity    
Derivative assets    
Derivative assets, netting (241) (157)
Derivative assets, net 44 36
LIABILITIES    
Derivative liabilities, netting 246 163
Derivative liabilities, net (29) (26)
Recurring | Other    
Derivative assets    
Derivative assets, netting 0 0
Derivative assets, net 9 2
LIABILITIES    
Derivative liabilities, netting 1 2
Derivative liabilities, net 0 (1)
Recurring | Foreign currency exchange contracts    
Derivative assets    
Derivative assets, netting (1) (5)
Derivative assets, net 0 1
LIABILITIES    
Derivative liabilities, netting 1 3
Derivative liabilities, net (2) 0
Recurring | Derivative assets — FTRs | DTE Electric    
Derivative assets    
Derivative assets, net 9 2
Recurring | Cash equivalents    
ASSETS    
Nuclear decommissioning trusts 14 8
Other investments 4 3
Recurring | Cash equivalents | DTE Electric    
ASSETS    
Nuclear decommissioning trusts 14 8
Recurring | Private equity securities    
ASSETS    
Nuclear decommissioning trusts 5 0
Derivative assets    
Private equity securities 5  
Recurring | Private equity securities | DTE Electric    
ASSETS    
Nuclear decommissioning trusts 5 0
Derivative assets    
Private equity securities 5  
Recurring | Equity securities    
ASSETS    
Nuclear decommissioning trusts 978 887
Other investments 118 104
Recurring | Equity securities | DTE Electric    
ASSETS    
Nuclear decommissioning trusts 978 887
Other investments 11 9
Recurring | Fixed Income Securities    
ASSETS    
Nuclear decommissioning trusts 495 425
Other investments 72 58
Recurring | Fixed Income Securities | DTE Electric    
ASSETS    
Nuclear decommissioning trusts 495 425
Recurring | Level 1    
ASSETS    
Cash and cash equivalents 16 14
Derivative assets    
Derivative assets, gross 148 216
Total assets 1,368 1,301
LIABILITIES    
Derivative liabilities, gross (141) (226)
Net Assets (Liabilities) at end of period 1,227 1,075
Recurring | Level 1 | DTE Electric    
ASSETS    
Cash and cash equivalents 8 8
Derivative assets    
Total assets 1,029 923
Recurring | Level 1 | Current asset    
Derivative assets    
Total assets 157 205
Recurring | Level 1 | Current asset | DTE Electric    
Derivative assets    
Total assets 8 8
Recurring | Level 1 | Noncurrent asset    
Derivative assets    
Total assets 1,211 1,096
Recurring | Level 1 | Noncurrent asset | DTE Electric    
Derivative assets    
Total assets 1,021 915
Recurring | Level 1 | Current liabilities    
LIABILITIES    
Derivative liabilities, gross (137) (203)
Recurring | Level 1 | Noncurrent liabilities    
LIABILITIES    
Derivative liabilities, gross (4) (23)
Recurring | Level 1 | Natural Gas    
Derivative assets    
Derivative assets, gross 148 216
LIABILITIES    
Derivative liabilities, gross (141) (226)
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 | 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 14 8
Other investments 4 3
Recurring | Level 1 | Cash equivalents | DTE Electric    
ASSETS    
Nuclear decommissioning trusts 14 8
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 978 887
Other investments 118 104
Recurring | Level 1 | Equity securities | DTE Electric    
ASSETS    
Nuclear decommissioning trusts 978 887
Other investments 11 9
Recurring | Level 1 | Fixed Income Securities    
ASSETS    
Nuclear decommissioning trusts 18 11
Other investments 72 58
Recurring | Level 1 | Fixed Income Securities | DTE Electric    
ASSETS    
Nuclear decommissioning trusts 18 11
Recurring | Level 2    
ASSETS    
Cash and cash equivalents 3 3
Derivative assets    
Derivative assets, gross 356 239
Total assets 836 656
LIABILITIES    
Derivative liabilities, gross (359) (248)
Net Assets (Liabilities) at end of period 477 408
Recurring | Level 2 | DTE Electric    
ASSETS    
Cash and cash equivalents 3 3
Derivative assets    
Total assets 480 417
Recurring | Level 2 | Current asset    
Derivative assets    
Total assets 298 199
Recurring | Level 2 | Current asset | DTE Electric    
Derivative assets    
Total assets 3 3
Recurring | Level 2 | Noncurrent asset    
Derivative assets    
Total assets 538 457
Recurring | Level 2 | Noncurrent asset | DTE Electric    
Derivative assets    
Total assets 477 414
Recurring | Level 2 | Current liabilities    
LIABILITIES    
Derivative liabilities, gross (313) (211)
Recurring | Level 2 | Noncurrent liabilities    
LIABILITIES    
Derivative liabilities, gross (46) (37)
Recurring | Level 2 | Natural Gas    
Derivative assets    
Derivative assets, gross 112 79
LIABILITIES    
Derivative liabilities, gross (111) (86)
Recurring | Level 2 | Electricity    
Derivative assets    
Derivative assets, gross 243 154
LIABILITIES    
Derivative liabilities, gross (245) (159)
Recurring | Level 2 | Other    
Derivative assets    
Derivative assets, gross 0 0
LIABILITIES    
Derivative liabilities, gross 0 0
Recurring | Level 2 | Foreign currency exchange contracts    
Derivative assets    
Derivative assets, gross 1 6
LIABILITIES    
Derivative liabilities, gross (3) (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 477 414
Other investments 0 0
Recurring | Level 2 | Fixed Income Securities | DTE Electric    
ASSETS    
Nuclear decommissioning trusts 477 414
Recurring | Level 3    
ASSETS    
Cash and cash equivalents 0 0
Derivative assets    
Derivative assets, gross 148 94
Total assets 148 94
LIABILITIES    
Derivative liabilities, gross (157) (182)
Net Assets (Liabilities) at end of period (9) (88)
Recurring | Level 3 | DTE Electric    
ASSETS    
Cash and cash equivalents 0 0
Derivative assets    
Total assets 9 2
Recurring | Level 3 | Current asset    
Derivative assets    
Total assets 104 60
Recurring | Level 3 | Current asset | DTE Electric    
Derivative assets    
Total assets 9 2
Recurring | Level 3 | Noncurrent asset    
Derivative assets    
Total assets 44 34
Recurring | Level 3 | Noncurrent asset | DTE Electric    
Derivative assets    
Total assets 0 0
Recurring | Level 3 | Current liabilities    
LIABILITIES    
Derivative liabilities, gross (108) (79)
Recurring | Level 3 | Noncurrent liabilities    
LIABILITIES    
Derivative liabilities, gross (49) (103)
Recurring | Level 3 | Natural Gas    
Derivative assets    
Derivative assets, gross 97 53
LIABILITIES    
Derivative liabilities, gross (126) (149)
Recurring | Level 3 | Electricity    
Derivative assets    
Derivative assets, gross 42 39
LIABILITIES    
Derivative liabilities, gross (30) (30)
Recurring | Level 3 | Other    
Derivative assets    
Derivative assets, gross 9 2
LIABILITIES    
Derivative liabilities, gross (1) (3)
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 9 2
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 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