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Fair Value (Assets and Liabilities Recorded at Fair Value on a Recurring Basis) (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Derivative assets    
Derivative assets, gross $ 340 $ 663
Derivative asset, netting (246) (530)
Derivative assets, net 94 133
Derivative liabilities    
Derivative liabilities, gross (338) (669)
Derivative liability, netting 236 513
Derivative liabilities, net (102) (156)
Current liabilities    
Derivative liabilities    
Derivative liabilities, gross (237) (518)
Noncurrent liabilities    
Derivative liabilities    
Derivative liabilities, gross (101) (151)
Natural gas    
Derivative assets    
Derivative assets, gross 178 349
Derivative asset, netting (116) (277)
Derivative assets, net 62 72
Derivative liabilities    
Derivative liabilities, gross (166) (380)
Derivative liability, netting 107 272
Derivative liabilities, net (59) (108)
Electricity    
Derivative assets    
Derivative assets, gross 155 303
Derivative asset, netting (128) (252)
Derivative assets, net 27 51
Derivative liabilities    
Derivative liabilities, gross (165) (285)
Derivative liability, netting 128 240
Derivative liabilities, net (37) (45)
Other    
Derivative assets    
Derivative assets, gross 4 7
Derivative asset, netting (2) (1)
Derivative assets, net 2 6
Derivative liabilities    
Derivative liabilities, gross (1) (1)
Derivative liability, netting 1 1
Derivative liabilities, net 0 0
Interest rate contracts    
Derivative liabilities    
Derivative liabilities, gross (6) (3)
Derivative liability, netting 0 0
Derivative liabilities, net (6) (3)
Foreign currency exchange contracts    
Derivative assets    
Derivative assets, gross 3 4
Derivative asset, netting 0 0
Derivative assets, net 3 4
Recurring    
Assets    
Cash equivalents 19 18
Derivative assets    
Derivative asset, netting (246) (530)
Derivative assets, net 94 133
Total assets 1,822 1,712
Derivative liabilities    
Derivative liability, netting 236 513
Derivative liabilities, net (102) (156)
Net Assets (Liabilities) at end of period 1,720 1,556
Net Assets (Liabilities) at end of period, netting (10) (17)
Recurring | DTE Electric    
Assets    
Cash equivalents 10 10
Derivative assets    
Total assets 1,532 1,404
Recurring | Current assets    
Derivative assets    
Derivative asset, netting (194) (461)
Total assets 91 120
Recurring | Current assets | DTE Electric    
Derivative assets    
Total assets 12 16
Recurring | Noncurrent assets    
Derivative assets    
Derivative asset, netting (52) (69)
Total assets 1,731 1,592
Recurring | Noncurrent assets | DTE Electric    
Derivative assets    
Total assets 1,520 1,388
Recurring | Current liabilities    
Derivative liabilities    
Derivative liability, netting 187 451
Derivative liabilities, net (50) (67)
Recurring | Noncurrent liabilities    
Derivative liabilities    
Derivative liability, netting 49 62
Derivative liabilities, net (52) (89)
Recurring | Cash and cash equivalents    
Assets    
Cash equivalents 4 3
Recurring | Restricted cash    
Assets    
Cash equivalents 5 5
Recurring | Other    
Assets    
Cash equivalents 10 10
Recurring | Other | DTE Electric    
Assets    
Cash equivalents 10 10
Recurring | Natural gas    
Derivative assets    
Derivative asset, netting (116) (277)
Derivative assets, net 62 72
Derivative liabilities    
Derivative liability, netting 107 272
Derivative liabilities, net (59) (108)
Recurring | Electricity    
Derivative assets    
Derivative asset, netting (128) (252)
Derivative assets, net 27 51
Derivative liabilities    
Derivative liability, netting 128 240
Derivative liabilities, net (37) (45)
Recurring | Other    
Derivative assets    
Derivative asset, netting (2) (1)
Derivative assets, net 2 6
Derivative liabilities    
Derivative liability, netting 1 1
Derivative liabilities, net 0 0
Recurring | Interest rate contracts    
Derivative liabilities    
Derivative liability, netting 0 0
Derivative liabilities, net (6) (3)
Recurring | Foreign currency exchange contracts    
Derivative assets    
Derivative asset, netting 0 0
Derivative assets, net 3 4
Derivative liabilities    
Derivative liability, netting 0 0
Derivative liabilities, net 0 0
Recurring | Derivative assets — FTRs | DTE Electric    
Derivative assets    
Derivative assets, net 2 6
Recurring | Cash equivalents    
Assets    
Nuclear decommissioning trusts 5 5
Other investments 4 4
Recurring | Cash equivalents | DTE Electric    
Assets    
Nuclear decommissioning trusts 5 5
Recurring | Private equity and other    
Assets    
Nuclear decommissioning trusts 23 20
Recurring | Private equity and other | DTE Electric    
Assets    
Nuclear decommissioning trusts 23 20
Recurring | Other    
Assets    
Other investments 0 0
Recurring | Equity securities    
Assets    
Nuclear decommissioning trusts 964 851
Other investments 124 110
Recurring | Equity securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 964 851
Other investments 11 10
Recurring | Fixed income securities    
Assets    
Nuclear decommissioning trusts 517 502
Other investments 72 69
Recurring | Fixed income securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 517 502
Recurring | Level 1    
Assets    
Cash equivalents 17 16
Derivative assets    
Derivative assets, gross 43 199
Total assets 1,242 1,266
Derivative liabilities    
Derivative liabilities, gross (42) (197)
Net Assets (Liabilities) at end of period 1,200 1,069
Recurring | Level 1 | DTE Electric    
Assets    
Cash equivalents 8 8
Derivative assets    
Total assets 1,001 886
Recurring | Level 1 | Current assets    
Derivative assets    
Total assets 57 212
Recurring | Level 1 | Current assets | DTE Electric    
Derivative assets    
Total assets 8 8
Recurring | Level 1 | Noncurrent assets    
Derivative assets    
Total assets 1,185 1,054
Recurring | Level 1 | Noncurrent assets | DTE Electric    
Derivative assets    
Total assets 993 878
Recurring | Level 1 | Current liabilities    
Derivative liabilities    
Derivative liabilities, gross (37) (191)
Recurring | Level 1 | Noncurrent liabilities    
Derivative liabilities    
Derivative liabilities, gross (5) (6)
Recurring | Level 1 | Natural gas    
Derivative assets    
Derivative assets, gross 41 199
Derivative liabilities    
Derivative liabilities, gross (42) (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 2 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
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 5 5
Other investments 4 4
Recurring | Level 1 | Cash equivalents | DTE Electric    
Assets    
Nuclear decommissioning trusts 5 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 | Other    
Assets    
Other investments 0 0
Recurring | Level 1 | Equity securities    
Assets    
Nuclear decommissioning trusts 964 851
Other investments 124 110
Recurring | Level 1 | Equity securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 964 851
Other investments 11 10
Recurring | Level 1 | Fixed income securities    
Assets    
Nuclear decommissioning trusts 13 12
Other investments 72 69
Recurring | Level 1 | Fixed income securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 13 12
Recurring | Level 2    
Assets    
Cash equivalents 2 2
Derivative assets    
Derivative assets, gross 217 338
Total assets 723 830
Derivative liabilities    
Derivative liabilities, gross (183) (302)
Net Assets (Liabilities) at end of period 540 528
Recurring | Level 2 | DTE Electric    
Assets    
Cash equivalents 2 2
Derivative assets    
Total assets 506 492
Recurring | Level 2 | Current assets    
Derivative assets    
Total assets 167 273
Recurring | Level 2 | Current assets | DTE Electric    
Derivative assets    
Total assets 2 2
Recurring | Level 2 | Noncurrent assets    
Derivative assets    
Total assets 556 557
Recurring | Level 2 | Noncurrent assets | DTE Electric    
Derivative assets    
Total assets 504 490
Recurring | Level 2 | Current liabilities    
Derivative liabilities    
Derivative liabilities, gross (147) (251)
Recurring | Level 2 | Noncurrent liabilities    
Derivative liabilities    
Derivative liabilities, gross (36) (51)
Recurring | Level 2 | Natural gas    
Derivative assets    
Derivative assets, gross 80 87
Derivative liabilities    
Derivative liabilities, gross (57) (71)
Recurring | Level 2 | Electricity    
Derivative assets    
Derivative assets, gross 134 247
Derivative liabilities    
Derivative liabilities, gross (119) (227)
Recurring | Level 2 | Other    
Derivative assets    
Derivative assets, gross 0 0
Derivative liabilities    
Derivative liabilities, gross (1) (1)
Recurring | Level 2 | Interest rate contracts    
Derivative liabilities    
Derivative liabilities, gross (6) (3)
Recurring | Level 2 | Foreign currency exchange contracts    
Derivative assets    
Derivative assets, gross 3 4
Derivative liabilities    
Derivative liabilities, gross 0 0
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 | Other    
Assets    
Other investments 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 504 490
Other investments 0 0
Recurring | Level 2 | Fixed income securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 504 490
Recurring | Level 3    
Assets    
Cash equivalents 0 0
Derivative assets    
Derivative assets, gross 80 126
Total assets 80 126
Derivative liabilities    
Derivative liabilities, gross (113) (170)
Net Assets (Liabilities) at end of period (33) (44)
Recurring | Level 3 | DTE Electric    
Assets    
Cash equivalents 0 0
Derivative assets    
Total assets 2 6
Recurring | Level 3 | Current assets    
Derivative assets    
Total assets 61 96
Recurring | Level 3 | Current assets | DTE Electric    
Derivative assets    
Total assets 2 6
Recurring | Level 3 | Noncurrent assets    
Derivative assets    
Total assets 19 30
Recurring | Level 3 | Noncurrent assets | DTE Electric    
Derivative assets    
Total assets 0 0
Recurring | Level 3 | Current liabilities    
Derivative liabilities    
Derivative liabilities, gross (53) (76)
Recurring | Level 3 | Noncurrent liabilities    
Derivative liabilities    
Derivative liabilities, gross (60) (94)
Recurring | Level 3 | Natural gas    
Derivative assets    
Derivative assets, gross 57 63
Derivative liabilities    
Derivative liabilities, gross (67) (112)
Recurring | Level 3 | Electricity    
Derivative assets    
Derivative assets, gross 21 56
Derivative liabilities    
Derivative liabilities, gross (46) (58)
Recurring | Level 3 | Other    
Derivative assets    
Derivative assets, gross 2 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
Derivative liabilities    
Derivative liabilities, gross 0 0
Recurring | Level 3 | Derivative assets — FTRs | DTE Electric    
Derivative assets    
Derivative assets, net 2 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 | Other    
Assets    
Other investments 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 23 20
Derivative liabilities    
Net Assets (Liabilities) at end of period 23 20
Recurring | Other | DTE Electric    
Derivative assets    
Total assets 23 20
Recurring | Other | Noncurrent assets    
Derivative assets    
Total assets 23 20
Recurring | Other | Noncurrent assets | DTE Electric    
Derivative assets    
Total assets 23 20
Recurring | Other | Private equity and other    
Assets    
Nuclear decommissioning trusts 23 20
Recurring | Other | Private equity and other | DTE Electric    
Assets    
Nuclear decommissioning trusts $ 23 $ 20