Fair Value (Assets and Liabilities Recorded at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Assets
Cash equivalents and Restricted cash	$ 176	$ 11
Derivative assets
Total derivative assets, gross	707	694
Total derivative assets, netting	(475)	(447)
Total derivative assets, net balance	232	247
Total Assets	3,093	2,622
Derivative liabilities
Total derivative liabilities, gross	(597)	(605)
Total derivative liability, netting	445	430
Total Liabilities	(152)	(175)
Net Assets (Liabilities) at end of period	2,941	2,447
Net Assets (Liabilities) at end of period, netting	(30)	(17)
DTE Electric
Assets
Cash equivalents and Restricted cash	83	8
Nuclear decommissioning trusts	2,552	2,256
Derivative assets
Total Assets	2,707	2,318
Current assets
Derivative assets
Total derivative assets, netting	(339)	(326)
Total Assets	319	173
Current assets | DTE Electric
Derivative assets
Total Assets	94	17
Noncurrent assets
Derivative assets
Total derivative assets, netting	(136)	(121)
Total Assets	2,774	2,449
Noncurrent assets | DTE Electric
Derivative assets
Total Assets	2,613	2,301
Current liabilities
Derivative liabilities
Total derivative liabilities, gross	(413)	(441)
Total derivative liability, netting	327	323
Total Liabilities	(86)	(118)
Noncurrent liabilities
Derivative liabilities
Total derivative liabilities, gross	(184)	(164)
Total derivative liability, netting	118	107
Total Liabilities	(66)	(57)
Restricted cash
Assets
Cash equivalents and Restricted cash	10	8
Restricted cash | DTE Electric
Assets
Cash equivalents and Restricted cash	10	8
Natural Gas
Derivative assets
Total derivative assets, gross	372	428
Total derivative assets, netting	(235)	(285)
Total derivative assets, net balance	137	143
Derivative liabilities
Total derivative liabilities, gross	(329)	(410)
Total derivative liability, netting	227	272
Total derivative liabilities, net balance	(102)	(138)
Electricity
Derivative assets
Total derivative assets, gross	275	187
Total derivative assets, netting	(194)	(116)
Total derivative assets, net balance	81	71
Derivative liabilities
Total derivative liabilities, gross	(235)	(150)
Total derivative liability, netting	186	114
Total derivative liabilities, net balance	(49)	(36)
Environmental & Other
Derivative assets
Total derivative assets, gross	57	58
Total derivative assets, netting	(46)	(46)
Total derivative assets, net balance	11	12
Derivative liabilities
Total derivative liabilities, gross	(32)	(44)
Total derivative liability, netting	32	44
Total derivative liabilities, net balance	0	0
Other contracts
Derivative assets
Total derivative assets, netting	0	0
Total derivative assets, net balance	3	21
Derivative liabilities
Total derivative liability, netting	0	0
Total derivative liabilities, net balance	(1)	(1)
Derivative assets — FTRs | DTE Electric
Derivative assets
Total derivative assets, net balance	11	9
Cash equivalents
Assets
Nuclear decommissioning trusts	35	26
Other investments	38	29
Cash equivalents | DTE Electric
Assets
Nuclear decommissioning trusts	35	26
Other investments	26	19
Private equity and other
Assets
Nuclear decommissioning trusts	358	349
Private equity and other | DTE Electric
Assets
Nuclear decommissioning trusts	358	349
Hedge Funds and Similar Investments
Assets
Nuclear decommissioning trusts	245	228
Hedge Funds and Similar Investments | DTE Electric
Assets
Nuclear decommissioning trusts	245	228
Equity securities
Assets
Nuclear decommissioning trusts	1,188	1,003
Other investments	84	72
Equity securities | DTE Electric
Assets
Nuclear decommissioning trusts	1,188	1,003
Other investments	33	26
Fixed income securities
Assets
Nuclear decommissioning trusts	726	650
Other investments	11	7
Fixed income securities | DTE Electric
Assets
Nuclear decommissioning trusts	726	650
Other investments	2	0
Level 1
Assets
Cash equivalents and Restricted cash	176	11
Derivative assets
Total derivative assets, gross	334	310
Total Assets	2,024	1,602
Derivative liabilities
Total Liabilities	(321)	(290)
Net Assets (Liabilities) at end of period	1,703	1,312
Level 1 | DTE Electric
Assets
Cash equivalents and Restricted cash	83	8
Derivative assets
Total Assets	1,525	1,226
Level 1 | Current assets
Derivative assets
Total Assets	426	223
Level 1 | Current assets | DTE Electric
Derivative assets
Total Assets	83	8
Level 1 | Noncurrent assets
Derivative assets
Total Assets	1,598	1,379
Level 1 | Noncurrent assets | DTE Electric
Derivative assets
Total Assets	1,442	1,218
Level 1 | Current liabilities
Derivative liabilities
Total Liabilities	(240)	(219)
Level 1 | Noncurrent liabilities
Derivative liabilities
Total Liabilities	(81)	(71)
Level 1 | Natural Gas
Derivative assets
Total derivative assets, gross	207	242
Derivative liabilities
Total derivative liabilities, gross	(196)	(217)
Level 1 | Electricity
Derivative assets
Total derivative assets, gross	127	67
Derivative liabilities
Total derivative liabilities, gross	(124)	(71)
Level 1 | Environmental & Other
Derivative assets
Total derivative assets, gross	0	1
Derivative liabilities
Total derivative liabilities, gross	(1)	(2)
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	35	26
Other investments	38	29
Level 1 | Cash equivalents | DTE Electric
Assets
Nuclear decommissioning trusts	35	26
Other investments	26	19
Level 1 | Private equity and other
Assets
Nuclear decommissioning trusts	0	16
Level 1 | Private equity and other | DTE Electric
Assets
Nuclear decommissioning trusts	0	16
Level 1 | Hedge Funds and Similar Investments
Assets
Nuclear decommissioning trusts	228	151
Level 1 | Hedge Funds and Similar Investments | DTE Electric
Assets
Nuclear decommissioning trusts	228	151
Level 1 | Equity securities
Assets
Nuclear decommissioning trusts	987	856
Other investments	84	72
Level 1 | Equity securities | DTE Electric
Assets
Nuclear decommissioning trusts	987	856
Other investments	33	26
Level 1 | Fixed income securities
Assets
Nuclear decommissioning trusts	133	124
Other investments	9	7
Level 1 | Fixed income securities | DTE Electric
Assets
Nuclear decommissioning trusts	133	124
Other investments	0	0
Level 2
Assets
Cash equivalents and Restricted cash	0	0
Derivative assets
Total derivative assets, gross	220	218
Total Assets	699	648
Derivative liabilities
Total Liabilities	(142)	(162)
Net Assets (Liabilities) at end of period	557	486
Level 2 | DTE Electric
Assets
Cash equivalents and Restricted cash	0	0
Derivative assets
Total Assets	479	430
Level 2 | Current assets
Derivative assets
Total Assets	130	170
Level 2 | Current assets | DTE Electric
Derivative assets
Total Assets	0	0
Level 2 | Noncurrent assets
Derivative assets
Total Assets	569	478
Level 2 | Noncurrent assets | DTE Electric
Derivative assets
Total Assets	479	430
Level 2 | Current liabilities
Derivative liabilities
Total Liabilities	(106)	(129)
Level 2 | Noncurrent liabilities
Derivative liabilities
Total Liabilities	(36)	(33)
Level 2 | Natural Gas
Derivative assets
Total derivative assets, gross	56	81
Derivative liabilities
Total derivative liabilities, gross	(51)	(70)
Level 2 | Electricity
Derivative assets
Total derivative assets, gross	115	69
Derivative liabilities
Total derivative liabilities, gross	(59)	(52)
Level 2 | Environmental & Other
Derivative assets
Total derivative assets, gross	46	47
Derivative liabilities
Total derivative liabilities, gross	(31)	(39)
Level 2 | Other contracts
Derivative assets
Total derivative assets, gross	3	21
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	17	16
Level 2 | Hedge Funds and Similar Investments | DTE Electric
Assets
Nuclear decommissioning trusts	17	16
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	460	414
Other investments	2	0
Level 2 | Fixed income securities | DTE Electric
Assets
Nuclear decommissioning trusts	460	414
Other investments	2	0
Level 3
Assets
Cash equivalents and Restricted cash	0	0
Derivative assets
Total derivative assets, gross	153	166
Total Assets	153	166
Derivative liabilities
Total Liabilities	(134)	(153)
Net Assets (Liabilities) at end of period	19	13
Level 3 | DTE Electric
Assets
Cash equivalents and Restricted cash	0	0
Derivative assets
Total Assets	11	9
Level 3 | Current assets
Derivative assets
Total Assets	102	106
Level 3 | Current assets | DTE Electric
Derivative assets
Total Assets	11	9
Level 3 | Noncurrent assets
Derivative assets
Total Assets	51	60
Level 3 | Noncurrent assets | DTE Electric
Derivative assets
Total Assets	0	0
Level 3 | Current liabilities
Derivative liabilities
Total Liabilities	(67)	(93)
Level 3 | Noncurrent liabilities
Derivative liabilities
Total Liabilities	(67)	(60)
Level 3 | Natural Gas
Derivative assets
Total derivative assets, gross	109	105
Derivative liabilities
Total derivative liabilities, gross	(82)	(123)
Level 3 | Electricity
Derivative assets
Total derivative assets, gross	33	51
Derivative liabilities
Total derivative liabilities, gross	(52)	(27)
Level 3 | Environmental & Other
Derivative assets
Total derivative assets, gross	11	10
Derivative liabilities
Total derivative liabilities, gross	0	(3)
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	11	9
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	692	653
Derivative liabilities
Net Assets (Liabilities) at end of period	692	653
Other | DTE Electric
Derivative assets
Total Assets	692	653
Other | Noncurrent assets
Derivative assets
Total Assets	692	653
Other | Noncurrent assets | DTE Electric
Derivative assets
Total Assets	692	653
Other | Private equity and other
Assets
Nuclear decommissioning trusts	358	333
Other | Private equity and other | DTE Electric
Assets
Nuclear decommissioning trusts	358	333
Other | Hedge Funds and Similar Investments
Assets
Nuclear decommissioning trusts	0	61
Other | Hedge Funds and Similar Investments | DTE Electric
Assets
Nuclear decommissioning trusts	0	61
Other | Equity securities
Assets
Nuclear decommissioning trusts	201	147
Other | Equity securities | DTE Electric
Assets
Nuclear decommissioning trusts	201	147
Other | Fixed income securities
Assets
Nuclear decommissioning trusts	133	112
Other | Fixed income securities | DTE Electric
Assets
Nuclear decommissioning trusts	$ 133	$ 112