Fair Value (Assets and Liabilities Recorded at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Derivative Assets
Derivative Assets, gross	$ 550	$ 711
Derivative asset, netting	(462)	(528)
Derivative assets, net	88	183
Derivative Liabilities
Derivative Liabilities	(629)	(705)
Derivative liability, netting	488	562
Derivative liabilities, net	(141)	(143)
Current derivative liability
Derivative Liabilities
Derivative Liabilities	(442)	(521)
Noncurrent derivative liability
Derivative Liabilities
Derivative Liabilities	(187)	(184)
Natural Gas
Derivative Assets
Derivative Assets, gross	298	387
Derivative asset, netting	(248)	(285)
Derivative assets, net	50	102
Derivative Liabilities
Derivative Liabilities	(375)	(383)
Derivative liability, netting	263	294
Derivative liabilities, net	(112)	(89)
Electricity
Derivative Assets
Derivative Assets, gross	239	307
Derivative asset, netting	(207)	(232)
Derivative assets, net	32	75
Derivative Liabilities
Derivative Liabilities	(240)	(305)
Derivative liability, netting	212	253
Derivative liabilities, net	(28)	(52)
Other
Derivative Assets
Derivative Assets, gross	7	5
Derivative asset, netting	(2)	(2)
Derivative assets, net	5	3
Derivative Liabilities
Derivative Liabilities	(11)	(10)
Derivative liability, netting	10	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	(3)	(7)
Derivative liability, netting	3	7
Derivative liabilities, net	0	0
Recurring
ASSETS
Cash equivalents	9	16
Nuclear decommissioning trusts	1,275	1,236
Alternative Investments valued at NAV as practical expedient for FV	0	4
Other investments	159	149
Derivative Assets
Derivative asset, netting	(462)	(528)
Derivative assets, net	88	183
Total assets	1,531	1,584
Derivative Liabilities
Derivative liability, netting	488	562
Derivative liabilities, net	(141)	(143)
Net Assets (Liabilities) at the end of the period	1,390	1,441
Net Assets (Liabilities) at the end of the period, netting	26	34
Recurring | Nuclear decommissioning trust fund
ASSETS
Alternative Investments valued at NAV as practical expedient for FV	0	4
Recurring | Restricted Assets
ASSETS
Cash equivalents	6	8
Recurring | Other Investments
ASSETS
Cash equivalents	3	8
Recurring | Current asset
Derivative Assets
Derivative asset, netting	(376)	(441)
Total assets	62	145
Recurring | Noncurrent asset
ASSETS
Alternative Investments valued at NAV as practical expedient for FV	0	4
Derivative Assets
Derivative asset, netting	(86)	(87)
Total assets	1,469	1,439
Recurring | Current derivative liability
Derivative Liabilities
Derivative liability, netting	395	464
Derivative liabilities, net	(47)	(57)
Recurring | Noncurrent derivative liability
Derivative Liabilities
Derivative liability, netting	93	98
Derivative liabilities, net	(94)	(86)
Recurring | Natural Gas
Derivative Assets
Derivative asset, netting	(248)	(285)
Derivative assets, net	50	102
Derivative Liabilities
Derivative liability, netting	263	294
Derivative liabilities, net	(112)	(89)
Recurring | Electricity
Derivative Assets
Derivative asset, netting	(207)	(232)
Derivative assets, net	32	75
Derivative Liabilities
Derivative liability, netting	212	253
Derivative liabilities, net	(28)	(52)
Recurring | Other
Derivative Assets
Derivative asset, netting	(2)	(2)
Derivative assets, net	5	3
Derivative Liabilities
Derivative liability, netting	10	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	0	0
Recurring | Level 1
ASSETS
Cash equivalents	6	13
Nuclear decommissioning trusts	853	759
Other investments	159	149
Derivative Assets
Derivative Assets, gross	172	195
Total assets	1,190	1,116
Derivative Liabilities
Derivative Liabilities	(196)	(220)
Net Assets (Liabilities) at the end of the period	994	896
Recurring | Level 1 | Current asset
Derivative Assets
Total assets	151	174
Recurring | Level 1 | Noncurrent asset
Derivative Assets
Total assets	1,039	942
Recurring | Level 1 | Current derivative liability
Derivative Liabilities
Derivative Liabilities	(166)	(174)
Recurring | Level 1 | Noncurrent derivative liability
Derivative Liabilities
Derivative Liabilities	(30)	(46)
Recurring | Level 1 | Natural Gas
Derivative Assets
Derivative Assets, gross	171	193
Derivative Liabilities
Derivative Liabilities	(193)	(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	1	2
Derivative Liabilities
Derivative Liabilities	(3)	(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	422	473
Other investments	0	0
Derivative Assets
Derivative Assets, gross	269	342
Total assets	694	818
Derivative Liabilities
Derivative Liabilities	(255)	(307)
Net Assets (Liabilities) at the end of the period	439	511
Recurring | Level 2 | Current asset
Derivative Assets
Total assets	220	284
Recurring | Level 2 | Noncurrent asset
Derivative Assets
Total assets	474	534
Recurring | Level 2 | Current derivative liability
Derivative Liabilities
Derivative Liabilities	(204)	(260)
Recurring | Level 2 | Noncurrent derivative liability
Derivative Liabilities
Derivative Liabilities	(51)	(47)
Recurring | Level 2 | Natural Gas
Derivative Assets
Derivative Assets, gross	65	91
Derivative Liabilities
Derivative Liabilities	(58)	(57)
Recurring | Level 2 | Electricity
Derivative Assets
Derivative Assets, gross	196	239
Derivative Liabilities
Derivative Liabilities	(191)	(243)
Recurring | Level 2 | Other
Derivative Assets
Derivative Assets, gross	2	0
Derivative Liabilities
Derivative Liabilities	(3)	0
Recurring | Level 2 | Foreign currency exchange contracts
Derivative Assets
Derivative Assets, gross	6	12
Derivative Liabilities
Derivative Liabilities	(3)	(7)
Recurring | Level 3
ASSETS
Cash equivalents	0	0
Nuclear decommissioning trusts	0	0
Other investments	0	0
Derivative Assets
Derivative Assets, gross	109	174
Total assets	109	174
Derivative Liabilities
Derivative Liabilities	(178)	(178)
Net Assets (Liabilities) at the end of the period	(69)	(4)
Recurring | Level 3 | Current asset
Derivative Assets
Total assets	67	128
Recurring | Level 3 | Noncurrent asset
Derivative Assets
Total assets	42	46
Recurring | Level 3 | Current derivative liability
Derivative Liabilities
Derivative Liabilities	(72)	(87)
Recurring | Level 3 | Noncurrent derivative liability
Derivative Liabilities
Derivative Liabilities	(106)	(91)
Recurring | Level 3 | Natural Gas
Derivative Assets
Derivative Assets, gross	62	103
Derivative Liabilities
Derivative Liabilities	(124)	(108)
Recurring | Level 3 | Electricity
Derivative Assets
Derivative Assets, gross	43	68
Derivative Liabilities
Derivative Liabilities	(49)	(62)
Recurring | Level 3 | Other
Derivative Assets
Derivative Assets, gross	4	3
Derivative Liabilities
Derivative Liabilities	(5)	(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	3	8
Nuclear decommissioning trusts	1,275	1,236
Alternative Investments valued at NAV as practical expedient for FV	0	4
Other investments	8	8
Derivative Assets
Total assets	1,290	1,255
DTE Electric | Recurring | Nuclear decommissioning trust fund
ASSETS
Alternative Investments valued at NAV as practical expedient for FV	0	4
DTE Electric | Recurring | Other Investments
ASSETS
Cash equivalents	3	8
DTE Electric | Recurring | Current asset
Derivative Assets
Total assets	7	11
DTE Electric | Recurring | Noncurrent asset
ASSETS
Alternative Investments valued at NAV as practical expedient for FV	0	4
Derivative Assets
Total assets	1,283	1,244
DTE Electric | Recurring | Financial transmission rights
Derivative Assets
Derivative assets, net	4	3
DTE Electric | Recurring | Level 1
ASSETS
Cash equivalents	0	5
Nuclear decommissioning trusts	853	759
Other investments	8	8
Derivative Assets
Total assets	861	772
DTE Electric | Recurring | Level 1 | Current asset
Derivative Assets
Total assets	0	5
DTE Electric | Recurring | Level 1 | Noncurrent asset
Derivative Assets
Total assets	861	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	422	473
Other investments	0	0
Derivative Assets
Total assets	425	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	422	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	4	3
DTE Electric | Recurring | Level 3 | Current asset
Derivative Assets
Total assets	4	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	$ 4	$ 3