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Fair Value (Assets and Liabilities Recorded at Fair Value on a Recurring Basis) (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Derivative assets    
Derivative assets, gross $ 565 $ 663
Derivative asset, netting (406) (530)
Derivative assets, net 159 133
Derivative liabilities    
Derivative liabilities, gross (572) (669)
Derivative liability, netting 410 513
Derivative liabilities, net (162) (156)
Current liabilities    
Derivative liabilities    
Derivative liabilities, gross (434) (518)
Noncurrent liabilities    
Derivative liabilities    
Derivative liabilities, gross (138) (151)
Natural gas    
Derivative assets    
Derivative assets, gross 235 349
Derivative asset, netting (170) (277)
Derivative assets, net 65 72
Derivative liabilities    
Derivative liabilities, gross (236) (380)
Derivative liability, netting 170 272
Derivative liabilities, net (66) (108)
Electricity    
Derivative assets    
Derivative assets, gross 320 303
Derivative asset, netting (236) (252)
Derivative assets, net 84 51
Derivative liabilities    
Derivative liabilities, gross (321) (285)
Derivative liability, netting 240 240
Derivative liabilities, net (81) (45)
Other    
Derivative assets    
Derivative assets, gross 9 7
Derivative asset, netting 0 (1)
Derivative assets, net 9 6
Derivative liabilities    
Derivative liabilities, gross 0 (1)
Derivative liability, netting 0 1
Derivative liabilities, net 0 0
Interest rate contracts    
Derivative liabilities    
Derivative liabilities, gross (15) (3)
Derivative liability, netting 0 0
Derivative liabilities, net (15) (3)
Foreign currency exchange contracts    
Derivative assets    
Derivative assets, gross 1 4
Derivative asset, netting 0 0
Derivative assets, net 1 4
Recurring    
Assets    
Cash equivalents 26 18
Derivative assets    
Derivative asset, netting (406) (530)
Derivative assets, net 159 133
Total assets 1,953 1,712
Derivative liabilities    
Derivative liability, netting 410 513
Derivative liabilities, net (162) (156)
Net Assets (Liabilities) at end of period 1,791 1,556
Net Assets (Liabilities) at end of period, netting 4 (17)
Recurring | DTE Electric    
Assets    
Cash equivalents 11 10
Derivative assets    
Total assets 1,592 1,404
Recurring | Current assets    
Derivative assets    
Derivative asset, netting (336) (461)
Total assets 139 120
Recurring | Current assets | DTE Electric    
Derivative assets    
Total assets 20 16
Recurring | Noncurrent assets    
Derivative assets    
Derivative asset, netting (70) (69)
Total assets 1,814 1,592
Recurring | Noncurrent assets | DTE Electric    
Derivative assets    
Total assets 1,572 1,388
Recurring | Current liabilities    
Derivative liabilities    
Derivative liability, netting 340 451
Derivative liabilities, net (94) (67)
Recurring | Noncurrent liabilities    
Derivative liabilities    
Derivative liability, netting 70 62
Derivative liabilities, net (68) (89)
Recurring | Cash and cash equivalents    
Assets    
Cash equivalents 15 3
Recurring | Restricted cash    
Assets    
Cash equivalents   5
Recurring | Other    
Assets    
Cash equivalents 11 10
Recurring | Other | DTE Electric    
Assets    
Cash equivalents 11 10
Recurring | Natural gas    
Derivative assets    
Derivative asset, netting (170) (277)
Derivative assets, net 65 72
Derivative liabilities    
Derivative liability, netting 170 272
Derivative liabilities, net (66) (108)
Recurring | Electricity    
Derivative assets    
Derivative asset, netting (236) (252)
Derivative assets, net 84 51
Derivative liabilities    
Derivative liability, netting 240 240
Derivative liabilities, net (81) (45)
Recurring | Other    
Derivative assets    
Derivative asset, netting 0 (1)
Derivative assets, net 9 6
Derivative liabilities    
Derivative liability, netting 0 1
Derivative liabilities, net 0 0
Recurring | Interest rate contracts    
Derivative liabilities    
Derivative liability, netting 0 0
Derivative liabilities, net (15) (3)
Recurring | Foreign currency exchange contracts    
Derivative assets    
Derivative asset, netting 0 0
Derivative assets, net 1 4
Recurring | Derivative assets — FTRs | DTE Electric    
Derivative assets    
Derivative assets, net 9 6
Recurring | Cash equivalents    
Assets    
Nuclear decommissioning trusts 9 5
Other investments 4 4
Recurring | Cash equivalents | DTE Electric    
Assets    
Nuclear decommissioning trusts 9 5
Recurring | Private equity and other    
Assets    
Nuclear decommissioning trusts 32 20
Recurring | Private equity and other | DTE Electric    
Assets    
Nuclear decommissioning trusts 32 20
Recurring | Equity securities    
Assets    
Nuclear decommissioning trusts 988 851
Other investments 128 110
Recurring | Equity securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 988 851
Other investments 11 10
Recurring | Fixed income securities    
Assets    
Nuclear decommissioning trusts 532 502
Other investments 75 69
Recurring | Fixed income securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 532 502
Recurring | Level 1    
Assets    
Cash equivalents 26 16
Derivative assets    
Derivative assets, gross 97 199
Total assets 1,336 1,266
Derivative liabilities    
Derivative liabilities, gross (119) (197)
Net Assets (Liabilities) at end of period 1,217 1,069
Recurring | Level 1 | DTE Electric    
Assets    
Cash equivalents 11 8
Derivative assets    
Total assets 1,028 886
Recurring | Level 1 | Current assets    
Derivative assets    
Total assets 122 212
Recurring | Level 1 | Current assets | DTE Electric    
Derivative assets    
Total assets 11 8
Recurring | Level 1 | Noncurrent assets    
Derivative assets    
Total assets 1,214 1,054
Recurring | Level 1 | Noncurrent assets | DTE Electric    
Derivative assets    
Total assets 1,017 878
Recurring | Level 1 | Current liabilities    
Derivative liabilities    
Derivative liabilities, gross (111) (191)
Recurring | Level 1 | Noncurrent liabilities    
Derivative liabilities    
Derivative liabilities, gross (8) (6)
Recurring | Level 1 | Natural gas    
Derivative assets    
Derivative assets, gross 97 199
Derivative liabilities    
Derivative liabilities, gross (119) (197)
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 0 0
Derivative liabilities    
Derivative liabilities, gross 0 0
Recurring | Level 1 | Interest rate contracts    
Derivative liabilities    
Derivative liabilities, gross 0 0
Recurring | Level 1 | Foreign currency exchange contracts    
Derivative assets    
Derivative assets, 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 9 5
Other investments 4 4
Recurring | Level 1 | Cash equivalents | DTE Electric    
Assets    
Nuclear decommissioning trusts 9 5
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 988 851
Other investments 128 110
Recurring | Level 1 | Equity securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 988 851
Other investments 11 10
Recurring | Level 1 | Fixed income securities    
Assets    
Nuclear decommissioning trusts 9 12
Other investments 75 69
Recurring | Level 1 | Fixed income securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 9 12
Recurring | Level 2    
Assets    
Cash equivalents 0 2
Derivative assets    
Derivative assets, gross 318 338
Total assets 841 830
Derivative liabilities    
Derivative liabilities, gross (312) (302)
Net Assets (Liabilities) at end of period 529 528
Recurring | Level 2 | DTE Electric    
Assets    
Cash equivalents 0 2
Derivative assets    
Total assets 523 492
Recurring | Level 2 | Current assets    
Derivative assets    
Total assets 249 273
Recurring | Level 2 | Current assets | DTE Electric    
Derivative assets    
Total assets 0 2
Recurring | Level 2 | Noncurrent assets    
Derivative assets    
Total assets 592 557
Recurring | Level 2 | Noncurrent assets | DTE Electric    
Derivative assets    
Total assets 523 490
Recurring | Level 2 | Current liabilities    
Derivative liabilities    
Derivative liabilities, gross (251) (251)
Recurring | Level 2 | Noncurrent liabilities    
Derivative liabilities    
Derivative liabilities, gross (61) (51)
Recurring | Level 2 | Natural gas    
Derivative assets    
Derivative assets, gross 78 87
Derivative liabilities    
Derivative liabilities, gross (47) (71)
Recurring | Level 2 | Electricity    
Derivative assets    
Derivative assets, gross 239 247
Derivative liabilities    
Derivative liabilities, gross (250) (227)
Recurring | Level 2 | Other    
Derivative assets    
Derivative assets, gross 0 0
Derivative liabilities    
Derivative liabilities, gross 0 (1)
Recurring | Level 2 | Interest rate contracts    
Derivative liabilities    
Derivative liabilities, gross (15) (3)
Recurring | Level 2 | Foreign currency exchange contracts    
Derivative assets    
Derivative assets, gross 1 4
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 523 490
Other investments 0 0
Recurring | Level 2 | Fixed income securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 523 490
Recurring | Level 3    
Assets    
Cash equivalents 0 0
Derivative assets    
Derivative assets, gross 150 126
Total assets 150 126
Derivative liabilities    
Derivative liabilities, gross (141) (170)
Net Assets (Liabilities) at end of period 9 (44)
Recurring | Level 3 | DTE Electric    
Assets    
Cash equivalents 0 0
Derivative assets    
Total assets 9 6
Recurring | Level 3 | Current assets    
Derivative assets    
Total assets 104 96
Recurring | Level 3 | Current assets | DTE Electric    
Derivative assets    
Total assets 9 6
Recurring | Level 3 | Noncurrent assets    
Derivative assets    
Total assets 46 30
Recurring | Level 3 | Noncurrent assets | DTE Electric    
Derivative assets    
Total assets 0 0
Recurring | Level 3 | Current liabilities    
Derivative liabilities    
Derivative liabilities, gross (72) (76)
Recurring | Level 3 | Noncurrent liabilities    
Derivative liabilities    
Derivative liabilities, gross (69) (94)
Recurring | Level 3 | Natural gas    
Derivative assets    
Derivative assets, gross 60 63
Derivative liabilities    
Derivative liabilities, gross (70) (112)
Recurring | Level 3 | Electricity    
Derivative assets    
Derivative assets, gross 81 56
Derivative liabilities    
Derivative liabilities, gross (71) (58)
Recurring | Level 3 | Other    
Derivative assets    
Derivative assets, gross 9 7
Derivative liabilities    
Derivative liabilities, gross 0 0
Recurring | Level 3 | Interest rate contracts    
Derivative liabilities    
Derivative liabilities, gross 0 0
Recurring | Level 3 | Foreign currency exchange contracts    
Derivative assets    
Derivative assets, gross 0 0
Recurring | Level 3 | Derivative assets — FTRs | DTE Electric    
Derivative assets    
Derivative assets, net 9 6
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 32 20
Derivative liabilities    
Net Assets (Liabilities) at end of period 32 20
Recurring | Other | DTE Electric    
Derivative assets    
Total assets 32 20
Recurring | Other | Noncurrent assets    
Derivative assets    
Total assets 32 20
Recurring | Other | Noncurrent assets | DTE Electric    
Derivative assets    
Total assets 32 20
Recurring | Other | Private equity and other    
Assets    
Nuclear decommissioning trusts 32 20
Recurring | Other | Private equity and other | DTE Electric    
Assets    
Nuclear decommissioning trusts $ 32 $ 20