Fair Value (Assets and Liabilities Recorded at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Derivative Assets
Derivative Assets, gross	$ 685	$ 711
Derivative asset, netting	(523)	(528)
Derivative assets, net	162	183
Derivative Liabilities
Derivative Liabilities	(763)	(705)
Derivative liability, netting	600	562
Derivative liabilities, net	(163)	(143)
Current derivative liability
Derivative Liabilities
Derivative Liabilities	(545)	(521)
Noncurrent derivative liability
Derivative Liabilities
Derivative Liabilities	(218)	(184)
Natural Gas
Derivative Assets
Derivative Assets, gross	298	387
Derivative asset, netting	(216)	(285)
Derivative assets, net	82	102
Derivative Liabilities
Derivative Liabilities	(350)	(383)
Derivative liability, netting	258	294
Derivative liabilities, net	(92)	(89)
Electricity
Derivative Assets
Derivative Assets, gross	377	307
Derivative asset, netting	(299)	(232)
Derivative assets, net	78	75
Derivative Liabilities
Derivative Liabilities	(396)	(305)
Derivative liability, netting	327	253
Derivative liabilities, net	(69)	(52)
Other
Derivative Assets
Derivative Assets, gross	4	5
Derivative asset, netting	(3)	(2)
Derivative assets, net	1	3
Derivative Liabilities
Derivative Liabilities	(13)	(10)
Derivative liability, netting	12	8
Derivative liabilities, net	(1)	(2)
Foreign currency exchange contracts
Derivative Assets
Derivative Assets, gross	6	12
Derivative asset, netting	(5)	(9)
Derivative assets, net	1	3
Derivative Liabilities
Derivative Liabilities	(4)	(7)
Derivative liability, netting	3	7
Derivative liabilities, net	(1)	0
Recurring
ASSETS
Cash equivalents	14	16
Nuclear decommissioning trusts	1,246	1,236
Alternative Investments valued at NAV as practical expedient for FV	3	4
Other investments	154	149
Derivative Assets
Derivative asset, netting	(523)	(528)
Derivative assets, net	162	183
Total assets	1,576	1,584
Derivative Liabilities
Derivative liability, netting	600	562
Derivative liabilities, net	(163)	(143)
Net Assets (Liabilities) at the end of the period	1,413	1,441
Net Assets (Liabilities) at the end of the period, netting	77	34
Recurring | Current asset
Derivative Assets
Derivative asset, netting	(418)	(441)
Total assets	123	145
Recurring | Noncurrent asset
ASSETS
Alternative Investments valued at NAV as practical expedient for FV	3	4
Derivative Assets
Derivative asset, netting	(105)	(87)
Total assets	1,453	1,439
Recurring | Current derivative liability
Derivative Liabilities
Derivative liability, netting	478	464
Derivative liabilities, net	(67)	(57)
Recurring | Noncurrent derivative liability
Derivative Liabilities
Derivative liability, netting	122	98
Derivative liabilities, net	(96)	(86)
Recurring | Natural Gas
Derivative Assets
Derivative asset, netting	(216)	(285)
Derivative assets, net	82	102
Derivative Liabilities
Derivative liability, netting	258	294
Derivative liabilities, net	(92)	(89)
Recurring | Electricity
Derivative Assets
Derivative asset, netting	(299)	(232)
Derivative assets, net	78	75
Derivative Liabilities
Derivative liability, netting	327	253
Derivative liabilities, net	(69)	(52)
Recurring | Other
Derivative Assets
Derivative asset, netting	(3)	(2)
Derivative assets, net	1	3
Derivative Liabilities
Derivative liability, netting	12	8
Derivative liabilities, net	(1)	(2)
Recurring | Foreign currency exchange contracts
Derivative Assets
Derivative asset, netting	(5)	(9)
Derivative assets, net	1	3
Derivative Liabilities
Derivative liability, netting	3	7
Derivative liabilities, net	(1)	0
Recurring | Level 1
ASSETS
Cash equivalents	11	13
Nuclear decommissioning trusts	752	759
Other investments	154	149
Derivative Assets
Derivative Assets, gross	136	195
Total assets	1,053	1,116
Derivative Liabilities
Derivative Liabilities	(193)	(220)
Net Assets (Liabilities) at the end of the period	860	896
Recurring | Level 1 | Current asset
Derivative Assets
Total assets	118	174
Recurring | Level 1 | Noncurrent asset
Derivative Assets
Total assets	935	942
Recurring | Level 1 | Current derivative liability
Derivative Liabilities
Derivative Liabilities	(150)	(174)
Recurring | Level 1 | Noncurrent derivative liability
Derivative Liabilities
Derivative Liabilities	(43)	(46)
Recurring | Level 1 | Natural Gas
Derivative Assets
Derivative Assets, gross	133	193
Derivative Liabilities
Derivative Liabilities	(188)	(218)
Recurring | Level 1 | Electricity
Derivative Assets
Derivative Assets, gross	0	0
Derivative Liabilities
Derivative Liabilities	0	0
Recurring | Level 1 | Other
Derivative Assets
Derivative Assets, gross	3	2
Derivative Liabilities
Derivative Liabilities	(5)	(2)
Recurring | Level 1 | Foreign currency exchange contracts
Derivative Assets
Derivative Assets, gross	0	0
Derivative Liabilities
Derivative Liabilities	0	0
Recurring | Level 2
ASSETS
Cash equivalents	3	3
Nuclear decommissioning trusts	491	473
Other investments	0	0
Derivative Assets
Derivative Assets, gross	400	342
Total assets	894	818
Derivative Liabilities
Derivative Liabilities	(364)	(307)
Net Assets (Liabilities) at the end of the period	530	511
Recurring | Level 2 | Current asset
Derivative Assets
Total assets	325	284
Recurring | Level 2 | Noncurrent asset
Derivative Assets
Total assets	569	534
Recurring | Level 2 | Current derivative liability
Derivative Liabilities
Derivative Liabilities	(296)	(260)
Recurring | Level 2 | Noncurrent derivative liability
Derivative Liabilities
Derivative Liabilities	(68)	(47)
Recurring | Level 2 | Natural Gas
Derivative Assets
Derivative Assets, gross	89	91
Derivative Liabilities
Derivative Liabilities	(52)	(57)
Recurring | Level 2 | Electricity
Derivative Assets
Derivative Assets, gross	305	239
Derivative Liabilities
Derivative Liabilities	(308)	(243)
Recurring | Level 2 | Other
Derivative Assets
Derivative Assets, gross	0	0
Derivative Liabilities
Derivative Liabilities	0	0
Recurring | Level 2 | Foreign currency exchange contracts
Derivative Assets
Derivative Assets, gross	6	12
Derivative Liabilities
Derivative Liabilities	(4)	(7)
Recurring | Level 3
ASSETS
Cash equivalents	0	0
Nuclear decommissioning trusts	0	0
Other investments	0	0
Derivative Assets
Derivative Assets, gross	149	174
Total assets	149	174
Derivative Liabilities
Derivative Liabilities	(206)	(178)
Net Assets (Liabilities) at the end of the period	(57)	(4)
Recurring | Level 3 | Current asset
Derivative Assets
Total assets	98	128
Recurring | Level 3 | Noncurrent asset
Derivative Assets
Total assets	51	46
Recurring | Level 3 | Current derivative liability
Derivative Liabilities
Derivative Liabilities	(99)	(87)
Recurring | Level 3 | Noncurrent derivative liability
Derivative Liabilities
Derivative Liabilities	(107)	(91)
Recurring | Level 3 | Natural Gas
Derivative Assets
Derivative Assets, gross	76	103
Derivative Liabilities
Derivative Liabilities	(110)	(108)
Recurring | Level 3 | Electricity
Derivative Assets
Derivative Assets, gross	72	68
Derivative Liabilities
Derivative Liabilities	(88)	(62)
Recurring | Level 3 | Other
Derivative Assets
Derivative Assets, gross	1	3
Derivative Liabilities
Derivative Liabilities	(8)	(8)
Recurring | Level 3 | Foreign currency exchange contracts
Derivative Assets
Derivative Assets, gross	0	0
Derivative Liabilities
Derivative Liabilities	0	0
DTE Electric | Recurring
ASSETS
Cash equivalents	7	8
Nuclear decommissioning trusts	1,246	1,236
Alternative Investments valued at NAV as practical expedient for FV	3	4
Other investments	8	8
Derivative Assets
Total assets	1,262	1,255
DTE Electric | Recurring | Current asset
Derivative Assets
Total assets	8	11
DTE Electric | Recurring | Noncurrent asset
ASSETS
Alternative Investments valued at NAV as practical expedient for FV	3	4
Derivative Assets
Total assets	1,254	1,244
DTE Electric | Recurring | Financial transmission rights
Derivative Assets
Derivative assets, net	1	3
DTE Electric | Recurring | Level 1
ASSETS
Cash equivalents	4	5
Nuclear decommissioning trusts	752	759
Other investments	8	8
Derivative Assets
Total assets	764	772
DTE Electric | Recurring | Level 1 | Current asset
Derivative Assets
Total assets	4	5
DTE Electric | Recurring | Level 1 | Noncurrent asset
Derivative Assets
Total assets	760	767
DTE Electric | Recurring | Level 1 | Financial transmission rights
Derivative Assets
Derivative assets, net	0	0
DTE Electric | Recurring | Level 2
ASSETS
Cash equivalents	3	3
Nuclear decommissioning trusts	491	473
Other investments	0	0
Derivative Assets
Total assets	494	476
DTE Electric | Recurring | Level 2 | Current asset
Derivative Assets
Total assets	3	3
DTE Electric | Recurring | Level 2 | Noncurrent asset
Derivative Assets
Total assets	491	473
DTE Electric | Recurring | Level 2 | Financial transmission rights
Derivative Assets
Derivative assets, net	0	0
DTE Electric | Recurring | Level 3
ASSETS
Cash equivalents	0	0
Nuclear decommissioning trusts	0	0
Other investments	0	0
Derivative Assets
Total assets	1	3
DTE Electric | Recurring | Level 3 | Current asset
Derivative Assets
Total assets	1	3
DTE Electric | Recurring | Level 3 | Noncurrent asset
Derivative Assets
Total assets	0	0
DTE Electric | Recurring | Level 3 | Financial transmission rights
Derivative Assets
Derivative assets, net	1	3
Nuclear decommissioning trust fund | Recurring
ASSETS
Alternative Investments valued at NAV as practical expedient for FV	3	4
Nuclear decommissioning trust fund | DTE Electric | Recurring
ASSETS
Alternative Investments valued at NAV as practical expedient for FV	$ 3	$ 4