Fair Value (Assets and Liabilities Measured and Recorded at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Assets
Cash equivalents and Restricted cash	$ 228	$ 176
Derivative assets
Total derivative assets, gross	723	707
Total derivative asset, netting	(519)	(475)
Total derivative assets, net balance	204	232
Total Assets	3,169	3,093
Derivative liabilities
Total derivative liabilities, gross	(750)	(597)
Total derivative liability, netting	545	445
Total Liabilities	(205)	(152)
Net Assets (Liabilities) at end of period	2,964	2,941
Net Assets at end of period, netting	26	(30)
DTE Electric
Assets
Cash equivalents and Restricted cash	95	83
Nuclear decommissioning trusts	2,599	2,552
Derivative assets
Total Assets	2,758	2,707
Current assets
Derivative assets
Total derivative asset, netting	(399)	(339)
Total Assets	365	319
Current assets | DTE Electric
Derivative assets
Total Assets	99	94
Noncurrent assets
Derivative assets
Total derivative asset, netting	(120)	(136)
Total Assets	2,804	2,774
Noncurrent assets | DTE Electric
Derivative assets
Total Assets	2,659	2,613
Current liabilities
Derivative liabilities
Total derivative liabilities, gross	(556)	(413)
Total derivative liability, netting	412	327
Total Liabilities	(144)	(86)
Noncurrent liabilities
Derivative liabilities
Total derivative liabilities, gross	(194)	(184)
Total derivative liability, netting	133	118
Total Liabilities	(61)	(66)
Restricted cash
Assets
Cash equivalents and Restricted cash	23	10
Restricted cash | DTE Electric
Assets
Cash equivalents and Restricted cash	23	10
Natural gas
Derivative assets
Total derivative assets, gross	289	372
Total derivative asset, netting	(170)	(235)
Total derivative assets, net balance	119	137
Derivative liabilities
Total derivative liabilities, gross	(333)	(329)
Total derivative liability, netting	210	227
Total derivative liabilities, net balance	(123)	(102)
Electricity
Derivative assets
Total derivative assets, gross	357	275
Total derivative asset, netting	(285)	(194)
Total derivative assets, net balance	72	81
Derivative liabilities
Total derivative liabilities, gross	(370)	(235)
Total derivative liability, netting	280	186
Total derivative liabilities, net balance	(90)	(49)
Environmental & Other
Derivative assets
Total derivative assets, gross	68	57
Total derivative asset, netting	(64)	(46)
Total derivative assets, net balance	4	11
Derivative liabilities
Total derivative liabilities, gross	(46)	(32)
Total derivative liability, netting	55	32
Total derivative liabilities, net balance	9	0
Other contracts
Derivative assets
Total derivative assets, net balance	9	3
Derivative liabilities
Total derivative liabilities, net balance	(1)	(1)
Derivative assets — FTRs | DTE Electric
Derivative assets
Total derivative assets, net balance	4	11
Cash equivalents
Assets
Nuclear decommissioning trusts	30	35
Other investments	44	38
Cash equivalents | DTE Electric
Assets
Nuclear decommissioning trusts	30	35
Other investments	27	26
Private equity and other
Assets
Nuclear decommissioning trusts	368	358
Private equity and other | DTE Electric
Assets
Nuclear decommissioning trusts	368	358
Hedge funds and similar investments
Assets
Nuclear decommissioning trusts	245	245
Hedge funds and similar investments | DTE Electric
Assets
Nuclear decommissioning trusts	245	245
Equity securities
Assets
Nuclear decommissioning trusts	1,195	1,188
Other investments	83	84
Equity securities | DTE Electric
Assets
Nuclear decommissioning trusts	1,195	1,188
Other investments	31	33
Fixed income securities
Assets
Nuclear decommissioning trusts	761	726
Other investments	11	11
Fixed income securities | DTE Electric
Assets
Nuclear decommissioning trusts	761	726
Other investments	2	2
Level 1
Assets
Cash equivalents and Restricted cash	228	176
Derivative assets
Total derivative assets, gross	336	334
Total Assets	2,056	2,024
Derivative liabilities
Total Liabilities	(403)	(321)
Net Assets (Liabilities) at end of period	1,653	1,703
Level 1 | DTE Electric
Assets
Cash equivalents and Restricted cash	95	83
Derivative assets
Total Assets	1,509	1,525
Level 1 | Current assets
Derivative assets
Total Assets	483	426
Level 1 | Current assets | DTE Electric
Derivative assets
Total Assets	95	83
Level 1 | Noncurrent assets
Derivative assets
Total Assets	1,573	1,598
Level 1 | Noncurrent assets | DTE Electric
Derivative assets
Total Assets	1,414	1,442
Level 1 | Current liabilities
Derivative liabilities
Total Liabilities	(292)	(240)
Level 1 | Noncurrent liabilities
Derivative liabilities
Total Liabilities	(111)	(81)
Level 1 | Natural gas
Derivative assets
Total derivative assets, gross	139	207
Derivative liabilities
Total derivative liabilities, gross	(223)	(196)
Level 1 | Electricity
Derivative assets
Total derivative assets, gross	192	127
Derivative liabilities
Total derivative liabilities, gross	(176)	(124)
Level 1 | Environmental & Other
Derivative assets
Total derivative assets, gross	5	0
Derivative liabilities
Total derivative liabilities, gross	(4)	(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	30	35
Other investments	44	38
Level 1 | Cash equivalents | DTE Electric
Assets
Nuclear decommissioning trusts	30	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	227	228
Level 1 | Hedge funds and similar investments | DTE Electric
Assets
Nuclear decommissioning trusts	227	228
Level 1 | Equity securities
Assets
Nuclear decommissioning trusts	953	987
Other investments	83	84
Level 1 | Equity securities | DTE Electric
Assets
Nuclear decommissioning trusts	953	987
Other investments	31	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	268	220
Total Assets	767	699
Derivative liabilities
Total Liabilities	(159)	(142)
Net Assets (Liabilities) at end of period	608	557
Level 2 | DTE Electric
Assets
Cash equivalents and Restricted cash	0	0
Derivative assets
Total Assets	499	479
Level 2 | Current assets
Derivative assets
Total Assets	217	130
Level 2 | Current assets | DTE Electric
Derivative assets
Total Assets	0	0
Level 2 | Noncurrent assets
Derivative assets
Total Assets	550	569
Level 2 | Noncurrent assets | DTE Electric
Derivative assets
Total Assets	499	479
Level 2 | Current liabilities
Derivative liabilities
Total Liabilities	(126)	(106)
Level 2 | Noncurrent liabilities
Derivative liabilities
Total Liabilities	(33)	(36)
Level 2 | Natural gas
Derivative assets
Total derivative assets, gross	51	56
Derivative liabilities
Total derivative liabilities, gross	(31)	(51)
Level 2 | Electricity
Derivative assets
Total derivative assets, gross	149	115
Derivative liabilities
Total derivative liabilities, gross	(85)	(59)
Level 2 | Environmental & Other
Derivative assets
Total derivative assets, gross	59	46
Derivative liabilities
Total derivative liabilities, gross	(42)	(31)
Level 2 | Other contracts
Derivative assets
Total derivative assets, gross	9	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	479	460
Other investments	2	2
Level 2 | Fixed income securities | DTE Electric
Assets
Nuclear decommissioning trusts	479	460
Other investments	2	2
Level 3
Assets
Cash equivalents and Restricted cash	0	0
Derivative assets
Total derivative assets, gross	119	153
Total Assets	119	153
Derivative liabilities
Total Liabilities	(188)	(134)
Net Assets (Liabilities) at end of period	(69)	19
Level 3 | DTE Electric
Assets
Cash equivalents and Restricted cash	0	0
Derivative assets
Total Assets	4	11
Level 3 | Current assets
Derivative assets
Total Assets	64	102
Level 3 | Current assets | DTE Electric
Derivative assets
Total Assets	4	11
Level 3 | Noncurrent assets
Derivative assets
Total Assets	55	51
Level 3 | Noncurrent assets | DTE Electric
Derivative assets
Total Assets	0	0
Level 3 | Current liabilities
Derivative liabilities
Total Liabilities	(138)	(67)
Level 3 | Noncurrent liabilities
Derivative liabilities
Total Liabilities	(50)	(67)
Level 3 | Natural gas
Derivative assets
Total derivative assets, gross	99	109
Derivative liabilities
Total derivative liabilities, gross	(79)	(82)
Level 3 | Electricity
Derivative assets
Total derivative assets, gross	16	33
Derivative liabilities
Total derivative liabilities, gross	(109)	(52)
Level 3 | Environmental & Other
Derivative assets
Total derivative assets, gross	4	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	4	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	746	692
Derivative liabilities
Net Assets (Liabilities) at end of period	746	692
Other | DTE Electric
Derivative assets
Total Assets	746	692
Other | Noncurrent assets
Derivative assets
Total Assets	746	692
Other | Noncurrent assets | DTE Electric
Derivative assets
Total Assets	746	692
Other | Private equity and other
Assets
Nuclear decommissioning trusts	368	358
Other | Private equity and other | DTE Electric
Assets
Nuclear decommissioning trusts	368	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	242	201
Other | Equity securities | DTE Electric
Assets
Nuclear decommissioning trusts	242	201
Other | Fixed income securities
Assets
Nuclear decommissioning trusts	136	133
Other | Fixed income securities | DTE Electric
Assets
Nuclear decommissioning trusts	$ 136	$ 133