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Fair Value (Assets and Liabilities Recorded at Fair Value on a Recurring Basis) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Derivative assets    
Derivative assets, gross $ 775 $ 663
Derivative assets, netting (601) (530)
Derivative assets, net 174 133
Liabilities    
Derivative liabilities, gross (770) (669)
Derivative liabilities, netting 601 513
Derivative liabilities, net (169) (156)
Current liabilities    
Liabilities    
Derivative liabilities, gross (596) (518)
Noncurrent liabilities    
Liabilities    
Derivative liabilities, gross (174) (151)
Natural Gas    
Derivative assets    
Derivative assets, gross 355 349
Derivative assets, netting (266) (277)
Derivative assets, net 89 72
Liabilities    
Derivative liabilities, gross (351) (380)
Derivative liabilities, netting 266 272
Derivative liabilities, net (85) (108)
Electricity    
Derivative assets    
Derivative assets, gross 306 303
Derivative assets, netting (225) (252)
Derivative assets, net 81 51
Liabilities    
Derivative liabilities, gross (298) (285)
Derivative liabilities, netting 225 240
Derivative liabilities, net (73) (45)
Environmental & Other    
Derivative assets    
Derivative assets, gross 113 7
Derivative assets, netting (110) (1)
Derivative assets, net 3 6
Liabilities    
Derivative liabilities, gross (121) (1)
Derivative liabilities, netting 110 1
Derivative liabilities, net (11) 0
Interest rate contracts    
Liabilities    
Derivative liabilities, gross 0 (3)
Derivative liabilities, netting 0 0
Derivative liabilities, net 0 (3)
Foreign currency exchange contracts    
Derivative assets    
Derivative assets, gross 1 4
Derivative assets, netting 0 0
Derivative assets, net 1 4
Recurring    
Assets    
Cash equivalents 15 18
Derivative assets    
Derivative assets, netting (601) (530)
Derivative assets, net 174 133
Total assets 2,073 1,712
Liabilities    
Derivative liabilities, netting 601 513
Derivative liabilities, net (169) (156)
Net Assets (Liabilities) at end of period 1,904 1,556
Net Assets (Liabilities) at the end of the period, netting 0 (17)
Recurring | DTE Electric    
Assets    
Cash equivalents 11 10
Derivative assets    
Total assets 1,688 1,404
Recurring | Current assets    
Derivative assets    
Derivative assets, netting (513) (461)
Total assets 148 120
Recurring | Current assets | DTE Electric    
Derivative assets    
Total assets 14 16
Recurring | Noncurrent assets    
Derivative assets    
Derivative assets, netting (88) (69)
Total assets 1,925 1,592
Recurring | Noncurrent assets | DTE Electric    
Derivative assets    
Total assets 1,674 1,388
Recurring | Current liabilities    
Liabilities    
Derivative liabilities, netting 513 451
Derivative liabilities, net (83) (67)
Recurring | Noncurrent liabilities    
Liabilities    
Derivative liabilities, netting 88 62
Derivative liabilities, net (86) (89)
Recurring | Cash and Cash equivalents    
Assets    
Cash equivalents 4 3
Recurring | Restricted cash    
Assets    
Cash equivalents   5
Recurring | Other investments    
Assets    
Cash equivalents 11 10
Recurring | Other investments | DTE Electric    
Assets    
Cash equivalents 11 10
Recurring | Natural Gas    
Derivative assets    
Derivative assets, netting (266) (277)
Derivative assets, net 89 72
Liabilities    
Derivative liabilities, netting 266 272
Derivative liabilities, net (85) (108)
Recurring | Electricity    
Derivative assets    
Derivative assets, netting (225) (252)
Derivative assets, net 81 51
Liabilities    
Derivative liabilities, netting 225 240
Derivative liabilities, net (73) (45)
Recurring | Environmental & Other    
Derivative assets    
Derivative assets, netting (110) (1)
Derivative assets, net 3 6
Liabilities    
Derivative liabilities, netting 110 1
Derivative liabilities, net (11) 0
Recurring | Interest rate contracts    
Liabilities    
Derivative liabilities, netting 0 0
Derivative liabilities, net 0 (3)
Recurring | Foreign currency exchange contracts    
Derivative assets    
Derivative assets, netting 0 0
Derivative assets, net 1 4
Recurring | Derivative assets — FTRs | DTE Electric    
Derivative assets    
Derivative assets, net 3 6
Recurring | Cash equivalents    
Assets    
Nuclear decommissioning trusts 34 5
Other investments 4 4
Recurring | Cash equivalents | DTE Electric    
Assets    
Nuclear decommissioning trusts 34 5
Recurring | Private equity and other    
Assets    
Nuclear decommissioning trusts 43 20
Recurring | Private equity and other | DTE Electric    
Assets    
Nuclear decommissioning trusts 43 20
Recurring | Equity securities    
Assets    
Nuclear decommissioning trusts 1,046 851
Other investments 140 110
Recurring | Equity securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 1,046 851
Other investments 13 10
Recurring | Fixed income securities    
Assets    
Nuclear decommissioning trusts 538 502
Other investments 79 69
Recurring | Fixed income securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 538 502
Recurring | Level 1    
Assets    
Cash equivalents 15 16
Derivative assets    
Derivative assets, gross 205 199
Total assets 1,683 1,266
Liabilities    
Derivative liabilities, gross (221) (197)
Net Assets (Liabilities) at end of period 1,462 1,069
Recurring | Level 1 | DTE Electric    
Assets    
Cash equivalents 11 8
Derivative assets    
Total assets 1,264 886
Recurring | Level 1 | Current assets    
Derivative assets    
Total assets 218 212
Recurring | Level 1 | Current assets | DTE Electric    
Derivative assets    
Total assets 11 8
Recurring | Level 1 | Noncurrent assets    
Derivative assets    
Total assets 1,465 1,054
Recurring | Level 1 | Noncurrent assets | DTE Electric    
Derivative assets    
Total assets 1,253 878
Recurring | Level 1 | Current liabilities    
Liabilities    
Derivative liabilities, gross (211) (191)
Recurring | Level 1 | Noncurrent liabilities    
Liabilities    
Derivative liabilities, gross (10) (6)
Recurring | Level 1 | Natural Gas    
Derivative assets    
Derivative assets, gross 205 199
Liabilities    
Derivative liabilities, gross (221) (197)
Recurring | Level 1 | Electricity    
Derivative assets    
Derivative assets, gross 0 0
Liabilities    
Derivative liabilities, gross 0 0
Recurring | Level 1 | Environmental & 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
Recurring | Level 1 | Derivative assets — FTRs | DTE Electric    
Derivative assets    
Derivative assets, net 0 0
Recurring | Level 1 | Cash equivalents    
Assets    
Nuclear decommissioning trusts 34 5
Other investments 4 4
Recurring | Level 1 | Cash equivalents | DTE Electric    
Assets    
Nuclear decommissioning trusts 34 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 1,046 851
Other investments 140 110
Recurring | Level 1 | Equity securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 1,046 851
Other investments 13 10
Recurring | Level 1 | Fixed income securities    
Assets    
Nuclear decommissioning trusts 160 12
Other investments 79 69
Recurring | Level 1 | Fixed income securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 160 12
Recurring | Level 2    
Assets    
Cash equivalents 0 2
Derivative assets    
Derivative assets, gross 410 338
Total assets 788 830
Liabilities    
Derivative liabilities, gross (393) (302)
Net Assets (Liabilities) at end of period 395 528
Recurring | Level 2 | DTE Electric    
Assets    
Cash equivalents 0 2
Derivative assets    
Total assets 378 492
Recurring | Level 2 | Current assets    
Derivative assets    
Total assets 320 273
Recurring | Level 2 | Current assets | DTE Electric    
Derivative assets    
Total assets 0 2
Recurring | Level 2 | Noncurrent assets    
Derivative assets    
Total assets 468 557
Recurring | Level 2 | Noncurrent assets | DTE Electric    
Derivative assets    
Total assets 378 490
Recurring | Level 2 | Current liabilities    
Liabilities    
Derivative liabilities, gross (300) (251)
Recurring | Level 2 | Noncurrent liabilities    
Liabilities    
Derivative liabilities, gross (93) (51)
Recurring | Level 2 | Natural Gas    
Derivative assets    
Derivative assets, gross 76 87
Liabilities    
Derivative liabilities, gross (41) (71)
Recurring | Level 2 | Electricity    
Derivative assets    
Derivative assets, gross 223 247
Liabilities    
Derivative liabilities, gross (231) (227)
Recurring | Level 2 | Environmental & Other    
Derivative assets    
Derivative assets, gross 110 0
Liabilities    
Derivative liabilities, gross (121) (1)
Recurring | Level 2 | Interest rate contracts    
Liabilities    
Derivative liabilities, gross 0 (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 378 490
Other investments 0 0
Recurring | Level 2 | Fixed income securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 378 490
Recurring | Level 3    
Assets    
Cash equivalents 0 0
Derivative assets    
Derivative assets, gross 160 126
Total assets 160 126
Liabilities    
Derivative liabilities, gross (156) (170)
Net Assets (Liabilities) at end of period 4 (44)
Recurring | Level 3 | DTE Electric    
Assets    
Cash equivalents 0 0
Derivative assets    
Total assets 3 6
Recurring | Level 3 | Current assets    
Derivative assets    
Total assets 123 96
Recurring | Level 3 | Current assets | DTE Electric    
Derivative assets    
Total assets 3 6
Recurring | Level 3 | Noncurrent assets    
Derivative assets    
Total assets 37 30
Recurring | Level 3 | Noncurrent assets | DTE Electric    
Derivative assets    
Total assets 0 0
Recurring | Level 3 | Current liabilities    
Liabilities    
Derivative liabilities, gross (85) (76)
Recurring | Level 3 | Noncurrent liabilities    
Liabilities    
Derivative liabilities, gross (71) (94)
Recurring | Level 3 | Natural Gas    
Derivative assets    
Derivative assets, gross 74 63
Liabilities    
Derivative liabilities, gross (89) (112)
Recurring | Level 3 | Electricity    
Derivative assets    
Derivative assets, gross 83 56
Liabilities    
Derivative liabilities, gross (67) (58)
Recurring | Level 3 | Environmental & Other    
Derivative assets    
Derivative assets, gross 3 7
Liabilities    
Derivative liabilities, gross 0 0
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
Recurring | Level 3 | Derivative assets — FTRs | DTE Electric    
Derivative assets    
Derivative assets, net 3 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 43 20
Liabilities    
Net Assets (Liabilities) at end of period 43 20
Recurring | Other | DTE Electric    
Derivative assets    
Total assets 43 20
Recurring | Other | Noncurrent assets    
Derivative assets    
Total assets 43 20
Recurring | Other | Noncurrent assets | DTE Electric    
Derivative assets    
Total assets 43 20
Recurring | Other | Private equity and other    
Assets    
Nuclear decommissioning trusts 43 20
Recurring | Other | Private equity and other | DTE Electric    
Assets    
Nuclear decommissioning trusts $ 43 $ 20