v3.26.1
Fair Value (Assets and Liabilities Measured and Recorded at Fair Value on a Recurring Basis) (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Assets    
Cash equivalents and Restricted cash $ 12 $ 176
Derivative assets    
Total derivative assets, gross 1,001 707
Total derivative asset, netting (726) (475)
Total derivative assets, net balance 275 232
Total Assets 3,186 3,093
Derivative liabilities    
Total derivative liabilities, gross (941) (597)
Total derivative liability, netting 733 445
Total Liabilities (208) (152)
Net Assets (Liabilities) at end of period 2,978 2,941
Net Assets at end of period, netting 7 (30)
DTE Electric    
Assets    
Cash equivalents and Restricted cash 10 83
Nuclear decommissioning trusts 2,756 2,552
Derivative assets    
Total Assets 2,854 2,707
Balance Sheet Location [Axis]: us-gaap:AssetsCurrent    
Derivative assets    
Total derivative asset, netting (582) (339)
Total Assets 197 319
Balance Sheet Location [Axis]: us-gaap:AssetsCurrent | DTE Electric    
Derivative assets    
Total Assets 33 94
Balance Sheet Location [Axis]: us-gaap:DerivativeAssetsCurrent    
Derivative assets    
Total derivative assets, gross 767 482
Balance Sheet Location [Axis]: us-gaap:DerivativeAssetsNoncurrent    
Derivative assets    
Total derivative assets, gross 234 225
Balance Sheet Location [Axis]: us-gaap:DerivativeLiabilitiesCurrent    
Derivative liabilities    
Total derivative liabilities, gross (739) (413)
Balance Sheet Location [Axis]: us-gaap:DerivativeLiabilitiesNoncurrent    
Derivative liabilities    
Total derivative liabilities, gross (202) (184)
Balance Sheet Location [Axis]: us-gaap:LiabilitiesCurrent    
Derivative liabilities    
Total derivative liability, netting 582 327
Total Liabilities (157) (86)
Balance Sheet Location [Axis]: us-gaap:OtherAssetsNoncurrent    
Derivative assets    
Total derivative asset, netting (144) (136)
Total Assets 2,989 2,774
Balance Sheet Location [Axis]: us-gaap:OtherAssetsNoncurrent | DTE Electric    
Derivative assets    
Total Assets 2,821 2,613
Balance Sheet Location [Axis]: us-gaap:OtherLiabilitiesNoncurrent    
Derivative liabilities    
Total derivative liability, netting 151 118
Total Liabilities (51) (66)
Balance Sheet Location [Axis]: us-gaap:RestrictedCashAndCashEquivalentsAtCarryingValue    
Assets    
Cash equivalents and Restricted cash 10 10
Balance Sheet Location [Axis]: us-gaap:RestrictedCashAndCashEquivalentsAtCarryingValue | DTE Electric    
Assets    
Cash equivalents and Restricted cash 10 10
Natural gas    
Derivative assets    
Total derivative assets, gross 293 372
Total derivative asset, netting (176) (235)
Total derivative assets, net balance 117 137
Derivative liabilities    
Total derivative liabilities, gross (313) (329)
Total derivative liability, netting 240 227
Total derivative liabilities, net balance (73) (102)
Electricity    
Derivative assets    
Total derivative assets, gross 608 275
Total derivative asset, netting (489) (194)
Total derivative assets, net balance 120 81
Derivative liabilities    
Total derivative liabilities, gross (578) (235)
Total derivative liability, netting 444 186
Total derivative liabilities, net balance (134) (49)
Environmental & Other    
Derivative assets    
Total derivative assets, gross 85 57
Total derivative asset, netting (61) (46)
Total derivative assets, net balance 23 11
Derivative liabilities    
Total derivative liabilities, gross (49) (32)
Total derivative liability, netting 49 32
Total derivative liabilities, net balance 0 0
Other contracts    
Derivative assets    
Total derivative assets, net balance 15 3
Derivative liabilities    
Total derivative liabilities, net balance (1) (1)
Derivative assets — FTRs | DTE Electric    
Derivative assets    
Total derivative assets, net balance 23 11
Cash equivalents    
Assets    
Nuclear decommissioning trusts 33 35
Other investments 38 38
Cash equivalents | DTE Electric    
Assets    
Nuclear decommissioning trusts 33 35
Other investments 27 26
Private equity and other    
Assets    
Nuclear decommissioning trusts 378 358
Private equity and other | DTE Electric    
Assets    
Nuclear decommissioning trusts 378 358
Hedge funds and similar investments    
Assets    
Nuclear decommissioning trusts 255 245
Hedge funds and similar investments | DTE Electric    
Assets    
Nuclear decommissioning trusts 255 245
Equity securities    
Assets    
Nuclear decommissioning trusts 1,284 1,188
Other investments 93 84
Equity securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 1,284 1,188
Other investments 36 33
Fixed income securities    
Assets    
Nuclear decommissioning trusts 806 726
Other investments 12 11
Fixed income securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 806 726
Other investments 2 2
Level 1    
Assets    
Cash equivalents and Restricted cash 12 176
Derivative assets    
Total derivative assets, gross 491 334
Total Assets 2,111 2,024
Derivative liabilities    
Total Liabilities (506) (321)
Net Assets (Liabilities) at end of period 1,605 1,703
Level 1 | DTE Electric    
Assets    
Cash equivalents and Restricted cash 10 83
Derivative assets    
Total Assets 1,540 1,525
Level 1 | Balance Sheet Location [Axis]: us-gaap:AssetsCurrent    
Derivative assets    
Total Assets 412 426
Level 1 | Balance Sheet Location [Axis]: us-gaap:AssetsCurrent | DTE Electric    
Derivative assets    
Total Assets 10 83
Level 1 | Balance Sheet Location [Axis]: us-gaap:LiabilitiesCurrent    
Derivative liabilities    
Total Liabilities (405) (240)
Level 1 | Balance Sheet Location [Axis]: us-gaap:OtherAssetsNoncurrent    
Derivative assets    
Total Assets 1,699 1,598
Level 1 | Balance Sheet Location [Axis]: us-gaap:OtherAssetsNoncurrent | DTE Electric    
Derivative assets    
Total Assets 1,530 1,442
Level 1 | Balance Sheet Location [Axis]: us-gaap:OtherLiabilitiesNoncurrent    
Derivative liabilities    
Total Liabilities (101) (81)
Level 1 | Natural gas    
Derivative assets    
Total derivative assets, gross 159 207
Derivative liabilities    
Total derivative liabilities, gross (220) (196)
Level 1 | Electricity    
Derivative assets    
Total derivative assets, gross 318 127
Derivative liabilities    
Total derivative liabilities, gross (270) (124)
Level 1 | Environmental & Other    
Derivative assets    
Total derivative assets, gross 14 0
Derivative liabilities    
Total derivative liabilities, gross (16) (1)
Level 1 | Other contracts    
Derivative assets    
Total derivative assets, gross 0 0
Derivative liabilities    
Total derivative liabilities, gross 0 0
Level 1 | Derivative assets — FTRs | DTE Electric    
Derivative assets    
Total derivative assets, net balance 0 0
Level 1 | Cash equivalents    
Assets    
Nuclear decommissioning trusts 33 35
Other investments 38 38
Level 1 | Cash equivalents | DTE Electric    
Assets    
Nuclear decommissioning trusts 33 35
Other investments 27 26
Level 1 | Private equity and other    
Assets    
Nuclear decommissioning trusts 0 0
Level 1 | Private equity and other | DTE Electric    
Assets    
Nuclear decommissioning trusts 0 0
Level 1 | Hedge funds and similar investments    
Assets    
Nuclear decommissioning trusts 237 228
Level 1 | Hedge funds and similar investments | DTE Electric    
Assets    
Nuclear decommissioning trusts 237 228
Level 1 | Equity securities    
Assets    
Nuclear decommissioning trusts 1,036 987
Other investments 93 84
Level 1 | Equity securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 1,036 987
Other investments 36 33
Level 1 | Fixed income securities    
Assets    
Nuclear decommissioning trusts 161 133
Other investments 10 9
Level 1 | Fixed income securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 161 133
Other investments 0 0
Level 2    
Assets    
Cash equivalents and Restricted cash 0 0
Derivative assets    
Total derivative assets, gross 367 220
Total Assets 894 699
Derivative liabilities    
Total Liabilities (190) (142)
Net Assets (Liabilities) at end of period 704 557
Level 2 | DTE Electric    
Assets    
Cash equivalents and Restricted cash 0 0
Derivative assets    
Total Assets 527 479
Level 2 | Balance Sheet Location [Axis]: us-gaap:AssetsCurrent    
Derivative assets    
Total Assets 278 130
Level 2 | Balance Sheet Location [Axis]: us-gaap:AssetsCurrent | DTE Electric    
Derivative assets    
Total Assets 0 0
Level 2 | Balance Sheet Location [Axis]: us-gaap:LiabilitiesCurrent    
Derivative liabilities    
Total Liabilities (150) (106)
Level 2 | Balance Sheet Location [Axis]: us-gaap:OtherAssetsNoncurrent    
Derivative assets    
Total Assets 616 569
Level 2 | Balance Sheet Location [Axis]: us-gaap:OtherAssetsNoncurrent | DTE Electric    
Derivative assets    
Total Assets 527 479
Level 2 | Balance Sheet Location [Axis]: us-gaap:OtherLiabilitiesNoncurrent    
Derivative liabilities    
Total Liabilities (40) (36)
Level 2 | Natural gas    
Derivative assets    
Total derivative assets, gross 40 56
Derivative liabilities    
Total derivative liabilities, gross (18) (51)
Level 2 | Electricity    
Derivative assets    
Total derivative assets, gross 265 115
Derivative liabilities    
Total derivative liabilities, gross (138) (59)
Level 2 | Environmental & Other    
Derivative assets    
Total derivative assets, gross 47 46
Derivative liabilities    
Total derivative liabilities, gross (33) (31)
Level 2 | Other contracts    
Derivative assets    
Total derivative assets, gross 15 3
Derivative liabilities    
Total derivative liabilities, gross (1) (1)
Level 2 | Derivative assets — FTRs | DTE Electric    
Derivative assets    
Total derivative assets, net balance 0 0
Level 2 | Cash equivalents    
Assets    
Nuclear decommissioning trusts 0 0
Other investments 0 0
Level 2 | Cash equivalents | DTE Electric    
Assets    
Nuclear decommissioning trusts 0 0
Other investments 0 0
Level 2 | Private equity and other    
Assets    
Nuclear decommissioning trusts 0 0
Level 2 | Private equity and other | DTE Electric    
Assets    
Nuclear decommissioning trusts 0 0
Level 2 | Hedge funds and similar investments    
Assets    
Nuclear decommissioning trusts 18 17
Level 2 | Hedge funds and similar investments | DTE Electric    
Assets    
Nuclear decommissioning trusts 18 17
Level 2 | Equity securities    
Assets    
Nuclear decommissioning trusts 0 0
Other investments 0 0
Level 2 | Equity securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 0 0
Other investments 0 0
Level 2 | Fixed income securities    
Assets    
Nuclear decommissioning trusts 507 460
Other investments 2 2
Level 2 | Fixed income securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 507 460
Other investments 2 2
Level 3    
Assets    
Cash equivalents and Restricted cash 0 0
Derivative assets    
Total derivative assets, gross 143 153
Total Assets 143 153
Derivative liabilities    
Total Liabilities (245) (134)
Net Assets (Liabilities) at end of period (102) 19
Level 3 | DTE Electric    
Assets    
Cash equivalents and Restricted cash 0 0
Derivative assets    
Total Assets 23 11
Level 3 | Balance Sheet Location [Axis]: us-gaap:AssetsCurrent    
Derivative assets    
Total Assets 89 102
Level 3 | Balance Sheet Location [Axis]: us-gaap:AssetsCurrent | DTE Electric    
Derivative assets    
Total Assets 23 11
Level 3 | Balance Sheet Location [Axis]: us-gaap:LiabilitiesCurrent    
Derivative liabilities    
Total Liabilities (184) (67)
Level 3 | Balance Sheet Location [Axis]: us-gaap:OtherAssetsNoncurrent    
Derivative assets    
Total Assets 54 51
Level 3 | Balance Sheet Location [Axis]: us-gaap:OtherAssetsNoncurrent | DTE Electric    
Derivative assets    
Total Assets 0 0
Level 3 | Balance Sheet Location [Axis]: us-gaap:OtherLiabilitiesNoncurrent    
Derivative liabilities    
Total Liabilities (61) (67)
Level 3 | Natural gas    
Derivative assets    
Total derivative assets, gross 94 109
Derivative liabilities    
Total derivative liabilities, gross (75) (82)
Level 3 | Electricity    
Derivative assets    
Total derivative assets, gross 26 33
Derivative liabilities    
Total derivative liabilities, gross (170) (52)
Level 3 | Environmental & Other    
Derivative assets    
Total derivative assets, gross 23 11
Derivative liabilities    
Total derivative liabilities, gross 0 0
Level 3 | Other contracts    
Derivative assets    
Total derivative assets, gross 0 0
Derivative liabilities    
Total derivative liabilities, gross 0 0
Level 3 | Derivative assets — FTRs | DTE Electric    
Derivative assets    
Total derivative assets, net balance 23 11
Level 3 | Cash equivalents    
Assets    
Nuclear decommissioning trusts 0 0
Other investments 0 0
Level 3 | Cash equivalents | DTE Electric    
Assets    
Nuclear decommissioning trusts 0 0
Other investments 0 0
Level 3 | Private equity and other    
Assets    
Nuclear decommissioning trusts 0 0
Level 3 | Private equity and other | DTE Electric    
Assets    
Nuclear decommissioning trusts 0 0
Level 3 | Hedge funds and similar investments    
Assets    
Nuclear decommissioning trusts 0 0
Level 3 | Hedge funds and similar investments | DTE Electric    
Assets    
Nuclear decommissioning trusts 0 0
Level 3 | Equity securities    
Assets    
Nuclear decommissioning trusts 0 0
Other investments 0 0
Level 3 | Equity securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 0 0
Other investments 0 0
Level 3 | Fixed income securities    
Assets    
Nuclear decommissioning trusts 0 0
Other investments 0 0
Level 3 | Fixed income securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 0 0
Other investments 0 0
Other    
Derivative assets    
Total Assets 764 692
Derivative liabilities    
Net Assets (Liabilities) at end of period 764 692
Other | DTE Electric    
Derivative assets    
Total Assets 764 692
Other | Balance Sheet Location [Axis]: us-gaap:OtherAssetsNoncurrent    
Derivative assets    
Total Assets 764 692
Other | Balance Sheet Location [Axis]: us-gaap:OtherAssetsNoncurrent | DTE Electric    
Derivative assets    
Total Assets 764 692
Other | Private equity and other    
Assets    
Nuclear decommissioning trusts 378 358
Other | Private equity and other | DTE Electric    
Assets    
Nuclear decommissioning trusts 378 358
Other | Hedge funds and similar investments    
Assets    
Nuclear decommissioning trusts 0 0
Other | Hedge funds and similar investments | DTE Electric    
Assets    
Nuclear decommissioning trusts 0 0
Other | Equity securities    
Assets    
Nuclear decommissioning trusts 248 201
Other | Equity securities | DTE Electric    
Assets    
Nuclear decommissioning trusts 248 201
Other | Fixed income securities    
Assets    
Nuclear decommissioning trusts 138 133
Other | Fixed income securities | DTE Electric    
Assets    
Nuclear decommissioning trusts $ 138 $ 133