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Fair Value (Assets and Liabilities Recorded at Fair Value on a Recurring Basis) (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Derivative assets    
Derivative assets, gross $ 429 $ 663
Derivative asset, netting (318) (530)
Derivative assets, net 111 133
Derivative liabilities    
Derivative liabilities, gross (460) (669)
Derivative liability, netting 318 513
Derivative liabilities, net (142) (156)
Current liabilities    
Derivative liabilities    
Derivative liabilities, gross (339) (518)
Noncurrent liabilities    
Derivative liabilities    
Derivative liabilities, gross (121) (151)
Natural gas    
Derivative assets    
Derivative assets, gross 253 349
Derivative asset, netting (189) (277)
Derivative assets, net 64 72
Derivative liabilities    
Derivative liabilities, gross (297) (380)
Derivative liability, netting 189 272
Derivative liabilities, net (108) (108)
Electricity    
Derivative assets    
Derivative assets, gross 164 303
Derivative asset, netting (124) (252)
Derivative assets, net 40 51
Derivative liabilities    
Derivative liabilities, gross (155) (285)
Derivative liability, netting 124 240
Derivative liabilities, net (31) (45)
Other    
Derivative assets    
Derivative assets, gross 10 7
Derivative asset, netting (5) (1)
Derivative assets, net 5 6
Derivative liabilities    
Derivative liabilities, gross (8) (1)
Derivative liability, netting 5 1
Derivative liabilities, net (3) 0
Interest rate contracts    
Derivative liabilities    
Derivative liabilities, gross 0 (3)
Derivative liability, netting 0 0
Derivative liabilities, net 0 (3)
Foreign currency exchange contracts    
Derivative assets    
Derivative assets, gross 2 4
Derivative asset, netting 0 0
Derivative assets, net 2 4
Recurring    
Assets    
Cash equivalents 21 18
Derivative assets    
Derivative asset, netting (318) (530)
Derivative assets, net 111 133
Total assets 1,921 1,712
Derivative liabilities    
Derivative liability, netting 318 513
Derivative liabilities, net (142) (156)
Net Assets (Liabilities) at end of period 1,779 1,556
Net Assets (Liabilities) at end of period, netting 0 (17)
Recurring | DTE Electric    
Assets    
Cash equivalents 11 10
Derivative assets    
Total assets 1,605 1,404
Recurring | Current assets    
Derivative assets    
Derivative asset, netting (271) (461)
Total assets 96 120
Recurring | Current assets | DTE Electric    
Derivative assets    
Total assets 16 16
Recurring | Noncurrent assets    
Derivative assets    
Derivative asset, netting (47) (69)
Total assets 1,825 1,592
Recurring | Noncurrent assets | DTE Electric    
Derivative assets    
Total assets 1,589 1,388
Recurring | Current liabilities    
Derivative liabilities    
Derivative liability, netting 271 451
Derivative liabilities, net (68) (67)
Recurring | Noncurrent liabilities    
Derivative liabilities    
Derivative liability, netting 47 62
Derivative liabilities, net (74) (89)
Recurring | Cash and cash equivalents    
Assets    
Cash equivalents 10 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 asset, netting (189) (277)
Derivative assets, net 64 72
Derivative liabilities    
Derivative liability, netting 189 272
Derivative liabilities, net (108) (108)
Recurring | Electricity    
Derivative assets    
Derivative asset, netting (124) (252)
Derivative assets, net 40 51
Derivative liabilities    
Derivative liability, netting 124 240
Derivative liabilities, net (31) (45)
Recurring | Other    
Derivative assets    
Derivative asset, netting (5) (1)
Derivative assets, net 5 6
Derivative liabilities    
Derivative liability, netting 5 1
Derivative liabilities, net (3) 0
Recurring | Interest rate contracts    
Derivative liabilities    
Derivative liability, netting 0 0
Derivative liabilities, net 0 (3)
Recurring | Foreign currency exchange contracts    
Derivative assets    
Derivative asset, netting 0 0
Derivative assets, net 2 4
Recurring | Derivative assets — FTRs | DTE Electric    
Derivative assets    
Derivative assets, net 5 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 34 20
Recurring | Private equity and other | DTE Electric    
Assets    
Nuclear decommissioning trusts 34 20
Recurring | Equity securities    
Assets    
Nuclear decommissioning trusts 990 851
Other investments 130 110
Recurring | Equity securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 990 851
Other investments 12 10
Recurring | Fixed income securities    
Assets    
Nuclear decommissioning trusts 544 502
Other investments 78 69
Recurring | Fixed income securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 544 502
Recurring | Level 1    
Assets    
Cash equivalents 21 16
Derivative assets    
Derivative assets, gross 114 199
Total assets 1,355 1,266
Derivative liabilities    
Derivative liabilities, gross (137) (197)
Net Assets (Liabilities) at end of period 1,218 1,069
Recurring | Level 1 | DTE Electric    
Assets    
Cash equivalents 11 8
Derivative assets    
Total assets 1,031 886
Recurring | Level 1 | Current assets    
Derivative assets    
Total assets 130 212
Recurring | Level 1 | Current assets | DTE Electric    
Derivative assets    
Total assets 11 8
Recurring | Level 1 | Noncurrent assets    
Derivative assets    
Total assets 1,225 1,054
Recurring | Level 1 | Noncurrent assets | DTE Electric    
Derivative assets    
Total assets 1,020 878
Recurring | Level 1 | Current liabilities    
Derivative liabilities    
Derivative liabilities, gross (123) (191)
Recurring | Level 1 | Noncurrent liabilities    
Derivative liabilities    
Derivative liabilities, gross (14) (6)
Recurring | Level 1 | Natural gas    
Derivative assets    
Derivative assets, gross 109 199
Derivative liabilities    
Derivative liabilities, gross (130) (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 5 0
Derivative liabilities    
Derivative liabilities, gross (7) 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 990 851
Other investments 130 110
Recurring | Level 1 | Equity securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 990 851
Other investments 12 10
Recurring | Level 1 | Fixed income securities    
Assets    
Nuclear decommissioning trusts 9 12
Other investments 78 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 220 338
Total assets 755 830
Derivative liabilities    
Derivative liabilities, gross (200) (302)
Net Assets (Liabilities) at end of period 555 528
Recurring | Level 2 | DTE Electric    
Assets    
Cash equivalents 0 2
Derivative assets    
Total assets 535 492
Recurring | Level 2 | Current assets    
Derivative assets    
Total assets 175 273
Recurring | Level 2 | Current assets | DTE Electric    
Derivative assets    
Total assets 0 2
Recurring | Level 2 | Noncurrent assets    
Derivative assets    
Total assets 580 557
Recurring | Level 2 | Noncurrent assets | DTE Electric    
Derivative assets    
Total assets 535 490
Recurring | Level 2 | Current liabilities    
Derivative liabilities    
Derivative liabilities, gross (163) (251)
Recurring | Level 2 | Noncurrent liabilities    
Derivative liabilities    
Derivative liabilities, gross (37) (51)
Recurring | Level 2 | Natural gas    
Derivative assets    
Derivative assets, gross 90 87
Derivative liabilities    
Derivative liabilities, gross (72) (71)
Recurring | Level 2 | Electricity    
Derivative assets    
Derivative assets, gross 128 247
Derivative liabilities    
Derivative liabilities, gross (127) (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 0 (3)
Recurring | Level 2 | Foreign currency exchange contracts    
Derivative assets    
Derivative assets, gross 2 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 535 490
Other investments 0 0
Recurring | Level 2 | Fixed income securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 535 490
Recurring | Level 3    
Assets    
Cash equivalents 0 0
Derivative assets    
Derivative assets, gross 95 126
Total assets 95 126
Derivative liabilities    
Derivative liabilities, gross (123) (170)
Net Assets (Liabilities) at end of period (28) (44)
Recurring | Level 3 | DTE Electric    
Assets    
Cash equivalents 0 0
Derivative assets    
Total assets 5 6
Recurring | Level 3 | Current assets    
Derivative assets    
Total assets 62 96
Recurring | Level 3 | Current assets | DTE Electric    
Derivative assets    
Total assets 5 6
Recurring | Level 3 | Noncurrent assets    
Derivative assets    
Total assets 33 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 (70) (94)
Recurring | Level 3 | Natural gas    
Derivative assets    
Derivative assets, gross 54 63
Derivative liabilities    
Derivative liabilities, gross (95) (112)
Recurring | Level 3 | Electricity    
Derivative assets    
Derivative assets, gross 36 56
Derivative liabilities    
Derivative liabilities, gross (28) (58)
Recurring | Level 3 | Other    
Derivative assets    
Derivative assets, gross 5 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 5 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 34 20
Derivative liabilities    
Net Assets (Liabilities) at end of period 34 20
Recurring | Other | DTE Electric    
Derivative assets    
Total assets 34 20
Recurring | Other | Noncurrent assets    
Derivative assets    
Total assets 34 20
Recurring | Other | Noncurrent assets | DTE Electric    
Derivative assets    
Total assets 34 20
Recurring | Other | Private equity and other    
Assets    
Nuclear decommissioning trusts 34 20
Recurring | Other | Private equity and other | DTE Electric    
Assets    
Nuclear decommissioning trusts $ 34 $ 20