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Fair Value (Assets and Liabilities Recorded at Fair Value on a Recurring Basis) (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Derivative Assets    
Derivative Assets $ 489 $ 711
Derivative asset, netting (387) (528)
Derivative assets, net 102 183
Derivative Liabilities    
Derivative Liabilities, gross (601) (705)
Derivative liability, netting 417 562
Derivative liabilities, net (184) (143)
Current derivative liabilities    
Derivative Liabilities    
Derivative Liabilities, gross (408) (521)
Noncurrent derivative liabilities    
Derivative Liabilities    
Derivative Liabilities, gross (193) (184)
Natural Gas    
Derivative Assets    
Derivative Assets 264 387
Derivative asset, netting (209) (285)
Derivative assets, net 55 102
Derivative Liabilities    
Derivative Liabilities, gross (361) (383)
Derivative liability, netting 218 294
Derivative liabilities, net (143) (89)
Electricity    
Derivative Assets    
Derivative Assets 213 307
Derivative asset, netting (169) (232)
Derivative assets, net 44 75
Derivative Liabilities    
Derivative Liabilities, gross (226) (305)
Derivative liability, netting 185 253
Derivative liabilities, net (41) (52)
Other    
Derivative Assets    
Derivative Assets 7 5
Derivative asset, netting (4) (2)
Derivative assets, net 3 3
Derivative Liabilities    
Derivative Liabilities, gross (11) (10)
Derivative liability, netting 11 8
Derivative liabilities, net 0 (2)
Foreign currency exchange contracts    
Derivative Assets    
Derivative Assets 5 12
Derivative asset, netting (5) (9)
Derivative assets, net 0 3
Derivative Liabilities    
Derivative Liabilities, gross (3) (7)
Derivative liability, netting 3 7
Derivative liabilities, net 0 0
Recurring    
ASSETS    
Cash equivalents 17 16
Nuclear decommissioning trusts 1,321 1,236
Alternative Investments valued at NAV as practical expedient for FV 0 4
Other investments 165 149
Derivative Assets    
Derivative asset, netting (387) (528)
Derivative assets, net 102 183
Total assets 1,605 1,584
Derivative Liabilities    
Derivative liability, netting 417 562
Derivative liabilities, net (184) (143)
Net Assets (Liabilities) at the end of the period 1,421 1,441
Net Assets (Liabilities) at the end of the period, netting 30 34
Recurring | Nuclear decommissioning trust fund    
ASSETS    
Alternative Investments valued at NAV as practical expedient for FV 0 4
Recurring | Current assets    
Derivative Assets    
Derivative asset, netting (303) (441)
Total assets 73 145
Recurring | Noncurrent assets    
ASSETS    
Alternative Investments valued at NAV as practical expedient for FV 0 4
Derivative Assets    
Derivative asset, netting (84) (87)
Total assets 1,532 1,439
Recurring | Current derivative liabilities    
Derivative Liabilities    
Derivative liability, netting 323 464
Derivative liabilities, net (85) (57)
Recurring | Noncurrent derivative liabilities    
Derivative Liabilities    
Derivative liability, netting 94 98
Derivative liabilities, net (99) (86)
Recurring | Restricted assets    
ASSETS    
Cash equivalents 6 8
Recurring | Other investments    
ASSETS    
Cash equivalents 11 8
Recurring | Natural Gas    
Derivative Assets    
Derivative asset, netting (209) (285)
Derivative assets, net 55 102
Derivative Liabilities    
Derivative liability, netting 218 294
Derivative liabilities, net (143) (89)
Recurring | Electricity    
Derivative Assets    
Derivative asset, netting (169) (232)
Derivative assets, net 44 75
Derivative Liabilities    
Derivative liability, netting 185 253
Derivative liabilities, net (41) (52)
Recurring | Other    
Derivative Assets    
Derivative asset, netting (4) (2)
Derivative assets, net 3 3
Derivative Liabilities    
Derivative liability, netting 11 8
Derivative liabilities, net 0 (2)
Recurring | Foreign currency exchange contracts    
Derivative Assets    
Derivative asset, netting (5) (9)
Derivative assets, net 0 3
Derivative Liabilities    
Derivative liability, netting 3 7
Derivative liabilities, net 0 0
Recurring | Level 1    
ASSETS    
Cash equivalents 14 13
Nuclear decommissioning trusts 891 759
Other investments 165 149
Derivative Assets    
Derivative Assets 116 195
Total assets 1,186 1,116
Derivative Liabilities    
Derivative Liabilities, gross (139) (220)
Net Assets (Liabilities) at the end of the period 1,047 896
Recurring | Level 1 | Current assets    
Derivative Assets    
Total assets 104 174
Recurring | Level 1 | Noncurrent assets    
Derivative Assets    
Total assets 1,082 942
Recurring | Level 1 | Current derivative liabilities    
Derivative Liabilities    
Derivative Liabilities, gross (109) (174)
Recurring | Level 1 | Noncurrent derivative liabilities    
Derivative Liabilities    
Derivative Liabilities, gross (30) (46)
Recurring | Level 1 | Natural Gas    
Derivative Assets    
Derivative Assets 114 193
Derivative Liabilities    
Derivative Liabilities, gross (135) (218)
Recurring | Level 1 | Electricity    
Derivative Assets    
Derivative Assets 0 0
Derivative Liabilities    
Derivative Liabilities, gross 0 0
Recurring | Level 1 | Other    
Derivative Assets    
Derivative Assets 2 2
Derivative Liabilities    
Derivative Liabilities, gross (4) (2)
Recurring | Level 1 | Foreign currency exchange contracts    
Derivative Assets    
Derivative Assets 0 0
Derivative Liabilities    
Derivative Liabilities, gross 0 0
Recurring | Level 2    
ASSETS    
Cash equivalents 3 3
Nuclear decommissioning trusts 430 473
Other investments 0 0
Derivative Assets    
Derivative Assets 288 342
Total assets 721 818
Derivative Liabilities    
Derivative Liabilities, gross (270) (307)
Net Assets (Liabilities) at the end of the period 451 511
Recurring | Level 2 | Current assets    
Derivative Assets    
Total assets 220 284
Recurring | Level 2 | Noncurrent assets    
Derivative Assets    
Total assets 501 534
Recurring | Level 2 | Current derivative liabilities    
Derivative Liabilities    
Derivative Liabilities, gross (207) (260)
Recurring | Level 2 | Noncurrent derivative liabilities    
Derivative Liabilities    
Derivative Liabilities, gross (63) (47)
Recurring | Level 2 | Natural Gas    
Derivative Assets    
Derivative Assets 106 91
Derivative Liabilities    
Derivative Liabilities, gross (82) (57)
Recurring | Level 2 | Electricity    
Derivative Assets    
Derivative Assets 175 239
Derivative Liabilities    
Derivative Liabilities, gross (182) (243)
Recurring | Level 2 | Other    
Derivative Assets    
Derivative Assets 2 0
Derivative Liabilities    
Derivative Liabilities, gross (3) 0
Recurring | Level 2 | Foreign currency exchange contracts    
Derivative Assets    
Derivative Assets 5 12
Derivative Liabilities    
Derivative Liabilities, gross (3) (7)
Recurring | Level 3    
ASSETS    
Cash equivalents 0 0
Nuclear decommissioning trusts 0 0
Other investments 0 0
Derivative Assets    
Derivative Assets 85 174
Total assets 85 174
Derivative Liabilities    
Derivative Liabilities, gross (192) (178)
Net Assets (Liabilities) at the end of the period (107) (4)
Recurring | Level 3 | Current assets    
Derivative Assets    
Total assets 52 128
Recurring | Level 3 | Noncurrent assets    
Derivative Assets    
Total assets 33 46
Recurring | Level 3 | Current derivative liabilities    
Derivative Liabilities    
Derivative Liabilities, gross (92) (87)
Recurring | Level 3 | Noncurrent derivative liabilities    
Derivative Liabilities    
Derivative Liabilities, gross (100) (91)
Recurring | Level 3 | Natural Gas    
Derivative Assets    
Derivative Assets 44 103
Derivative Liabilities    
Derivative Liabilities, gross (144) (108)
Recurring | Level 3 | Electricity    
Derivative Assets    
Derivative Assets 38 68
Derivative Liabilities    
Derivative Liabilities, gross (44) (62)
Recurring | Level 3 | Other    
Derivative Assets    
Derivative Assets 3 3
Derivative Liabilities    
Derivative Liabilities, gross (4) (8)
Recurring | Level 3 | Foreign currency exchange contracts    
Derivative Assets    
Derivative Assets 0 0
Derivative Liabilities    
Derivative Liabilities, gross 0 0
DTE Electric | Recurring    
ASSETS    
Cash equivalents 11 8
Nuclear decommissioning trusts 1,321 1,236
Alternative Investments valued at NAV as practical expedient for FV 0 4
Other investments 8 8
Derivative Assets    
Total assets 1,343 1,255
DTE Electric | Recurring | Nuclear decommissioning trust fund    
ASSETS    
Alternative Investments valued at NAV as practical expedient for FV 0 4
DTE Electric | Recurring | Current assets    
Derivative Assets    
Total assets 14 11
DTE Electric | Recurring | Noncurrent assets    
ASSETS    
Alternative Investments valued at NAV as practical expedient for FV 0 4
Derivative Assets    
Total assets 1,329 1,244
DTE Electric | Recurring | Other investments    
ASSETS    
Cash equivalents 11 8
DTE Electric | Recurring | Financial transmission rights    
Derivative Assets    
Derivative assets, net 3 3
DTE Electric | Recurring | Level 1    
ASSETS    
Cash equivalents 8 5
Nuclear decommissioning trusts 891 759
Other investments 8 8
Derivative Assets    
Total assets 907 772
DTE Electric | Recurring | Level 1 | Current assets    
Derivative Assets    
Total assets 8 5
DTE Electric | Recurring | Level 1 | Noncurrent assets    
Derivative Assets    
Total assets 899 767
DTE Electric | Recurring | Level 1 | Financial transmission rights    
Derivative Assets    
Derivative assets, net 0 0
DTE Electric | Recurring | Level 2    
ASSETS    
Cash equivalents 3 3
Nuclear decommissioning trusts 430 473
Other investments 0 0
Derivative Assets    
Total assets 433 476
DTE Electric | Recurring | Level 2 | Current assets    
Derivative Assets    
Total assets 3 3
DTE Electric | Recurring | Level 2 | Noncurrent assets    
Derivative Assets    
Total assets 430 473
DTE Electric | Recurring | Level 2 | Financial transmission rights    
Derivative Assets    
Derivative assets, net 0 0
DTE Electric | Recurring | Level 3    
ASSETS    
Cash equivalents 0 0
Nuclear decommissioning trusts 0 0
Other investments 0 0
Derivative Assets    
Total assets 3 3
DTE Electric | Recurring | Level 3 | Current assets    
Derivative Assets    
Total assets 3 3
DTE Electric | Recurring | Level 3 | Noncurrent assets    
Derivative Assets    
Total assets 0 0
DTE Electric | Recurring | Level 3 | Financial transmission rights    
Derivative Assets    
Derivative assets, net $ 3 $ 3