Fair Value (Assets and Liabilities Measured and Recorded at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Millions	Sep. 30, 2026	Dec. 31, 2025
Assets
Cash equivalents and Restricted cash	$ 27	$ 176
Derivative assets
Total derivative assets, gross	1,056	707
Total derivative asset, netting	(748)	(475)
Total derivative assets, net balance	308	232
Total Assets	3,184	3,093
Derivative liabilities
Total derivative liabilities, gross	(962)	(597)
Total derivative liability, netting	757	445
Total Liabilities	(205)	(152)
Net Assets (Liabilities) at end of period	2,979	2,941
Net Assets at end of period, netting	9	(30)
DTE Electric
Assets
Cash equivalents and Restricted cash	23	83
Nuclear decommissioning trusts	2,706	2,552
Derivative assets
Total Assets	2,826	2,707
Balance Sheet Location [Axis]: us-gaap:AssetsCurrent
Derivative assets
Total derivative asset, netting	(566)	(339)
Total Assets	193	319
Balance Sheet Location [Axis]: us-gaap:AssetsCurrent | DTE Electric
Derivative assets
Total Assets	53	94
Balance Sheet Location [Axis]: us-gaap:DerivativeAssetsCurrent
Derivative assets
Total derivative assets, gross	732	482
Balance Sheet Location [Axis]: us-gaap:DerivativeAssetsNoncurrent
Derivative assets
Total derivative assets, gross	324	225
Balance Sheet Location [Axis]: us-gaap:DerivativeLiabilitiesCurrent
Derivative liabilities
Total derivative liabilities, gross	(708)	(413)
Balance Sheet Location [Axis]: us-gaap:DerivativeLiabilitiesNoncurrent
Derivative liabilities
Total derivative liabilities, gross	(254)	(184)
Balance Sheet Location [Axis]: us-gaap:LiabilitiesCurrent
Derivative liabilities
Total derivative liability, netting	561	327
Total Liabilities	(147)	(86)
Balance Sheet Location [Axis]: us-gaap:OtherAssetsNoncurrent
Derivative assets
Total derivative asset, netting	(182)	(136)
Total Assets	2,991	2,774
Balance Sheet Location [Axis]: us-gaap:OtherAssetsNoncurrent | DTE Electric
Derivative assets
Total Assets	2,773	2,613
Balance Sheet Location [Axis]: us-gaap:OtherLiabilitiesNoncurrent
Derivative liabilities
Total derivative liability, netting	196	118
Total Liabilities	(58)	(66)
Balance Sheet Location [Axis]: us-gaap:RestrictedCashAndCashEquivalentsAtCarryingValue
Assets
Cash equivalents and Restricted cash	23	10
Balance Sheet Location [Axis]: us-gaap:RestrictedCashAndCashEquivalentsAtCarryingValue | DTE Electric
Assets
Cash equivalents and Restricted cash	23	10
Natural gas
Derivative assets
Total derivative assets, gross	346	372
Total derivative asset, netting	(245)	(235)
Total derivative assets, net balance	101	137
Derivative liabilities
Total derivative liabilities, gross	(366)	(329)
Total derivative liability, netting	245	227
Total derivative liabilities, net balance	(121)	(102)
Electricity
Derivative assets
Total derivative assets, gross	593	275
Total derivative asset, netting	(466)	(194)
Total derivative assets, net balance	127	81
Derivative liabilities
Total derivative liabilities, gross	(560)	(235)
Total derivative liability, netting	475	186
Total derivative liabilities, net balance	(85)	(49)
Environmental & Other
Derivative assets
Total derivative assets, gross	73	57
Total derivative asset, netting	(37)	(46)
Total derivative assets, net balance	36	11
Derivative liabilities
Total derivative liabilities, gross	(35)	(32)
Total derivative liability, netting	37	32
Total derivative liabilities, net balance	2	0
Other contracts
Derivative assets
Total derivative assets, net balance	44	3
Derivative liabilities
Total derivative liabilities, net balance	(1)	(1)
Derivative assets — FTRs | DTE Electric
Derivative assets
Total derivative assets, net balance	30	11
Cash equivalents
Assets
Nuclear decommissioning trusts	37	35
Other investments	39	38
Cash equivalents | DTE Electric
Assets
Nuclear decommissioning trusts	37	35
Other investments	28	26
Private equity and other
Assets
Nuclear decommissioning trusts	381	358
Private equity and other | DTE Electric
Assets
Nuclear decommissioning trusts	381	358
Hedge funds and similar investments
Assets
Nuclear decommissioning trusts	258	245
Hedge funds and similar investments | DTE Electric
Assets
Nuclear decommissioning trusts	258	245
Equity securities
Assets
Nuclear decommissioning trusts	1,252	1,188
Other investments	93	84
Equity securities | DTE Electric
Assets
Nuclear decommissioning trusts	1,252	1,188
Other investments	37	33
Fixed income securities
Assets
Nuclear decommissioning trusts	778	726
Other investments	11	11
Fixed income securities | DTE Electric
Assets
Nuclear decommissioning trusts	778	726
Other investments	2	2
Level 1
Assets
Cash equivalents and Restricted cash	27	176
Derivative assets
Total derivative assets, gross	532	334
Total Assets	2,063	2,024
Derivative liabilities
Total Liabilities	(546)	(321)
Net Assets (Liabilities) at end of period	1,517	1,703
Level 1 | DTE Electric
Assets
Cash equivalents and Restricted cash	23	83
Derivative assets
Total Assets	1,451	1,525
Level 1 | Balance Sheet Location [Axis]: us-gaap:AssetsCurrent
Derivative assets
Total Assets	424	426
Level 1 | Balance Sheet Location [Axis]: us-gaap:AssetsCurrent | DTE Electric
Derivative assets
Total Assets	23	83
Level 1 | Balance Sheet Location [Axis]: us-gaap:LiabilitiesCurrent
Derivative liabilities
Total Liabilities	(418)	(240)
Level 1 | Balance Sheet Location [Axis]: us-gaap:OtherAssetsNoncurrent
Derivative assets
Total Assets	1,639	1,598
Level 1 | Balance Sheet Location [Axis]: us-gaap:OtherAssetsNoncurrent | DTE Electric
Derivative assets
Total Assets	1,428	1,442
Level 1 | Balance Sheet Location [Axis]: us-gaap:OtherLiabilitiesNoncurrent
Derivative liabilities
Total Liabilities	(128)	(81)
Level 1 | Natural gas
Derivative assets
Total derivative assets, gross	210	207
Derivative liabilities
Total derivative liabilities, gross	(268)	(196)
Level 1 | Electricity
Derivative assets
Total derivative assets, gross	307	127
Derivative liabilities
Total derivative liabilities, gross	(259)	(124)
Level 1 | Environmental & Other
Derivative assets
Total derivative assets, gross	15	0
Derivative liabilities
Total derivative liabilities, gross	(19)	(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	37	35
Other investments	39	38
Level 1 | Cash equivalents | DTE Electric
Assets
Nuclear decommissioning trusts	37	35
Other investments	28	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	166	228
Level 1 | Hedge funds and similar investments | DTE Electric
Assets
Nuclear decommissioning trusts	166	228
Level 1 | Equity securities
Assets
Nuclear decommissioning trusts	1,014	987
Other investments	93	84
Level 1 | Equity securities | DTE Electric
Assets
Nuclear decommissioning trusts	1,014	987
Other investments	37	33
Level 1 | Fixed income securities
Assets
Nuclear decommissioning trusts	146	133
Other investments	9	9
Level 1 | Fixed income securities | DTE Electric
Assets
Nuclear decommissioning trusts	146	133
Other investments	0	0
Level 2
Assets
Cash equivalents and Restricted cash	0	0
Derivative assets
Total derivative assets, gross	379	220
Total Assets	895	699
Derivative liabilities
Total Liabilities	(199)	(142)
Net Assets (Liabilities) at end of period	696	557
Level 2 | DTE Electric
Assets
Cash equivalents and Restricted cash	0	0
Derivative assets
Total Assets	516	479
Level 2 | Balance Sheet Location [Axis]: us-gaap:AssetsCurrent
Derivative assets
Total Assets	229	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	(141)	(106)
Level 2 | Balance Sheet Location [Axis]: us-gaap:OtherAssetsNoncurrent
Derivative assets
Total Assets	666	569
Level 2 | Balance Sheet Location [Axis]: us-gaap:OtherAssetsNoncurrent | DTE Electric
Derivative assets
Total Assets	516	479
Level 2 | Balance Sheet Location [Axis]: us-gaap:OtherLiabilitiesNoncurrent
Derivative liabilities
Total Liabilities	(58)	(36)
Level 2 | Natural gas
Derivative assets
Total derivative assets, gross	50	56
Derivative liabilities
Total derivative liabilities, gross	(30)	(51)
Level 2 | Electricity
Derivative assets
Total derivative assets, gross	257	115
Derivative liabilities
Total derivative liabilities, gross	(152)	(59)
Level 2 | Environmental & Other
Derivative assets
Total derivative assets, gross	28	46
Derivative liabilities
Total derivative liabilities, gross	(16)	(31)
Level 2 | Other contracts
Derivative assets
Total derivative assets, gross	44	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	496	460
Other investments	2	2
Level 2 | Fixed income securities | DTE Electric
Assets
Nuclear decommissioning trusts	496	460
Other investments	2	2
Level 3
Assets
Cash equivalents and Restricted cash	0	0
Derivative assets
Total derivative assets, gross	145	153
Total Assets	145	153
Derivative liabilities
Total Liabilities	(217)	(134)
Net Assets (Liabilities) at end of period	(72)	19
Level 3 | DTE Electric
Assets
Cash equivalents and Restricted cash	0	0
Derivative assets
Total Assets	30	11
Level 3 | Balance Sheet Location [Axis]: us-gaap:AssetsCurrent
Derivative assets
Total Assets	106	102
Level 3 | Balance Sheet Location [Axis]: us-gaap:AssetsCurrent | DTE Electric
Derivative assets
Total Assets	30	11
Level 3 | Balance Sheet Location [Axis]: us-gaap:LiabilitiesCurrent
Derivative liabilities
Total Liabilities	(149)	(67)
Level 3 | Balance Sheet Location [Axis]: us-gaap:OtherAssetsNoncurrent
Derivative assets
Total Assets	39	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	(68)	(67)
Level 3 | Natural gas
Derivative assets
Total derivative assets, gross	86	109
Derivative liabilities
Total derivative liabilities, gross	(68)	(82)
Level 3 | Electricity
Derivative assets
Total derivative assets, gross	29	33
Derivative liabilities
Total derivative liabilities, gross	(149)	(52)
Level 3 | Environmental & Other
Derivative assets
Total derivative assets, gross	30	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	30	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	829	692
Derivative liabilities
Net Assets (Liabilities) at end of period	829	692
Other | DTE Electric
Derivative assets
Total Assets	829	692
Other | Balance Sheet Location [Axis]: us-gaap:OtherAssetsNoncurrent
Derivative assets
Total Assets	829	692
Other | Balance Sheet Location [Axis]: us-gaap:OtherAssetsNoncurrent | DTE Electric
Derivative assets
Total Assets	829	692
Other | Private equity and other
Assets
Nuclear decommissioning trusts	381	358
Other | Private equity and other | DTE Electric
Assets
Nuclear decommissioning trusts	381	358
Other | Hedge funds and similar investments
Assets
Nuclear decommissioning trusts	74	0
Other | Hedge funds and similar investments | DTE Electric
Assets
Nuclear decommissioning trusts	74	0
Other | Equity securities
Assets
Nuclear decommissioning trusts	238	201
Other | Equity securities | DTE Electric
Assets
Nuclear decommissioning trusts	238	201
Other | Fixed income securities
Assets
Nuclear decommissioning trusts	136	133
Other | Fixed income securities | DTE Electric
Assets
Nuclear decommissioning trusts	$ 136	$ 133