Fair Value (Assets and Liabilities Recorded at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Derivative assets
Derivative assets, gross	$ 439	$ 549
Derivative asset, netting	(301)	(468)
Derivative assets, net	138	81
Derivative liabilities
Derivative liabilities, gross	(409)	(656)
Derivative liability, netting	319	489
Derivative liabilities, net	(90)	(167)
Decommissioning fund outstanding commitments	25
DTE Electric
Derivative liabilities
Decommissioning fund outstanding commitments	25
Current derivative liabilities
Derivative liabilities
Derivative liabilities, gross	(297)	(493)
Noncurrent derivative liabilities
Derivative liabilities
Derivative liabilities, gross	(112)	(163)
Natural Gas
Derivative assets
Derivative assets, gross	230	348
Derivative asset, netting	(151)	(306)
Derivative assets, net	79	42
Derivative liabilities
Derivative liabilities, gross	(204)	(461)
Derivative liability, netting	151	321
Derivative liabilities, net	(53)	(140)
Electricity
Derivative assets
Derivative assets, gross	202	193
Derivative asset, netting	(148)	(157)
Derivative assets, net	54	36
Derivative liabilities
Derivative liabilities, gross	(199)	(189)
Derivative liability, netting	164	163
Derivative liabilities, net	(35)	(26)
Other
Derivative assets
Derivative assets, gross	4	2
Derivative asset, netting	0	0
Derivative assets, net	4	2
Derivative liabilities
Derivative liabilities, gross	(2)	(3)
Derivative liability, netting	2	2
Derivative liabilities, net	0	(1)
Foreign currency exchange contracts
Derivative assets
Derivative assets, gross	3	6
Derivative asset, netting	(2)	(5)
Derivative assets, net	1	1
Derivative liabilities
Derivative liabilities, gross	(4)	(3)
Derivative liability, netting	2	3
Derivative liabilities, net	(2)	0
Recurring
Assets:
Cash equivalents	19	17
Derivative assets
Derivative asset, netting	(301)	(468)
Derivative assets, net	138	81
Total assets	1,783	1,583
Derivative liabilities
Derivative liability, netting	319	489
Derivative liabilities, net	(90)	(167)
Net Assets (Liabilities) at the end of the period	1,693	1,416
Net Assets (Liabilities) at the end of the period, netting	18	21
Recurring | DTE Electric
Assets:
Cash equivalents	11	11
Derivative assets
Total assets	1,464	1,342
Recurring | Current assets
Derivative assets
Derivative asset, netting	(225)	(400)
Total assets	95	64
Recurring | Current assets | DTE Electric
Derivative assets
Total assets	15	13
Recurring | Noncurrent assets
Derivative assets
Derivative asset, netting	(76)	(68)
Total assets	1,688	1,519
Recurring | Noncurrent assets | DTE Electric
Derivative assets
Total assets	1,449	1,329
Recurring | Current derivative liabilities
Derivative liabilities
Derivative liability, netting	255	424
Derivative liabilities, net	(42)	(69)
Recurring | Noncurrent derivative liabilities
Derivative liabilities
Derivative liability, netting	64	65
Derivative liabilities, net	(48)	(98)
Recurring | Restricted assets
Assets:
Cash equivalents	8	7
Recurring | Other
Assets:
Cash equivalents	11	10
Recurring | Other | DTE Electric
Assets:
Cash equivalents	11	11
Recurring | Natural Gas
Derivative assets
Derivative asset, netting	(151)	(306)
Derivative assets, net	79	42
Derivative liabilities
Derivative liability, netting	151	321
Derivative liabilities, net	(53)	(140)
Recurring | Electricity
Derivative assets
Derivative asset, netting	(148)	(157)
Derivative assets, net	54	36
Derivative liabilities
Derivative liability, netting	164	163
Derivative liabilities, net	(35)	(26)
Recurring | Other
Derivative assets
Derivative asset, netting	0	0
Derivative assets, net	4	2
Derivative liabilities
Derivative liability, netting	2	2
Derivative liabilities, net	0	(1)
Recurring | Foreign currency exchange contracts
Derivative assets
Derivative asset, netting	(2)	(5)
Derivative assets, net	1	1
Derivative liabilities
Derivative liability, netting	2	3
Derivative liabilities, net	(2)	0
Recurring | Derivative assets — FTRs | DTE Electric
Derivative assets
Derivative assets, net	4	2
Recurring | Cash equivalents
Assets:
Nuclear decommissioning trusts	6	8
Other investments	4	3
Recurring | Cash equivalents | DTE Electric
Assets:
Nuclear decommissioning trusts	6	8
Recurring | Equity securities
Assets:
Nuclear decommissioning trusts	949	887
Other investments	120	104
Recurring | Equity securities | DTE Electric
Assets:
Nuclear decommissioning trusts	949	887
Other investments	10	9
Recurring | Fixed income securities
Assets:
Nuclear decommissioning trusts	484	425
Other investments	63	58
Recurring | Fixed income securities | DTE Electric
Assets:
Nuclear decommissioning trusts	484	425
Recurring | Level 1
Assets:
Cash equivalents	16	14
Derivative assets
Derivative assets, gross	64	216
Total assets	1,232	1,301
Derivative liabilities
Derivative liabilities, gross	(64)	(226)
Net Assets (Liabilities) at the end of the period	1,168	1,075
Recurring | Level 1 | DTE Electric
Assets:
Cash equivalents	8	8
Derivative assets
Total assets	983	923
Recurring | Level 1 | Current assets
Derivative assets
Total assets	65	205
Recurring | Level 1 | Current assets | DTE Electric
Derivative assets
Total assets	8	8
Recurring | Level 1 | Noncurrent assets
Derivative assets
Total assets	1,167	1,096
Recurring | Level 1 | Noncurrent assets | DTE Electric
Derivative assets
Total assets	975	915
Recurring | Level 1 | Current derivative liabilities
Derivative liabilities
Derivative liabilities, gross	(60)	(203)
Recurring | Level 1 | Noncurrent derivative liabilities
Derivative liabilities
Derivative liabilities, gross	(4)	(23)
Recurring | Level 1 | Natural Gas
Derivative assets
Derivative assets, gross	64	216
Derivative liabilities
Derivative liabilities, gross	(64)	(226)
Recurring | Level 1 | Electricity
Derivative assets
Derivative assets, gross	0	0
Derivative liabilities
Derivative liabilities, gross	0	0
Recurring | Level 1 | Other
Derivative assets
Derivative assets, gross	0	0
Derivative liabilities
Derivative liabilities, gross	0	0
Recurring | Level 1 | Foreign currency exchange contracts
Derivative assets
Derivative assets, gross	0	0
Derivative liabilities
Derivative liabilities, gross	0	0
Recurring | Level 1 | Derivative assets — FTRs | DTE Electric
Derivative assets
Derivative assets, net	0	0
Recurring | Level 1 | Cash equivalents
Assets:
Nuclear decommissioning trusts	6	8
Other investments	4	3
Recurring | Level 1 | Cash equivalents | DTE Electric
Assets:
Nuclear decommissioning trusts	6	8
Recurring | Level 1 | Equity securities
Assets:
Nuclear decommissioning trusts	949	887
Other investments	120	104
Recurring | Level 1 | Equity securities | DTE Electric
Assets:
Nuclear decommissioning trusts	949	887
Other investments	10	9
Recurring | Level 1 | Fixed income securities
Assets:
Nuclear decommissioning trusts	10	11
Other investments	63	58
Recurring | Level 1 | Fixed income securities | DTE Electric
Assets:
Nuclear decommissioning trusts	10	11
Recurring | Level 2
Assets:
Cash equivalents	3	3
Derivative assets
Derivative assets, gross	262	239
Total assets	739	656
Derivative liabilities
Derivative liabilities, gross	(239)	(248)
Net Assets (Liabilities) at the end of the period	500	408
Recurring | Level 2 | DTE Electric
Assets:
Cash equivalents	3	3
Derivative assets
Total assets	477	417
Recurring | Level 2 | Current assets
Derivative assets
Total assets	194	199
Recurring | Level 2 | Current assets | DTE Electric
Derivative assets
Total assets	3	3
Recurring | Level 2 | Noncurrent assets
Derivative assets
Total assets	545	457
Recurring | Level 2 | Noncurrent assets | DTE Electric
Derivative assets
Total assets	474	414
Recurring | Level 2 | Current derivative liabilities
Derivative liabilities
Derivative liabilities, gross	(183)	(211)
Recurring | Level 2 | Noncurrent derivative liabilities
Derivative liabilities
Derivative liabilities, gross	(56)	(37)
Recurring | Level 2 | Natural Gas
Derivative assets
Derivative assets, gross	104	79
Derivative liabilities
Derivative liabilities, gross	(76)	(86)
Recurring | Level 2 | Electricity
Derivative assets
Derivative assets, gross	155	154
Derivative liabilities
Derivative liabilities, gross	(159)	(159)
Recurring | Level 2 | Other
Derivative assets
Derivative assets, gross	0	0
Derivative liabilities
Derivative liabilities, gross	0	0
Recurring | Level 2 | Foreign currency exchange contracts
Derivative assets
Derivative assets, gross	3	6
Derivative liabilities
Derivative liabilities, gross	(4)	(3)
Recurring | Level 2 | Derivative assets — FTRs | DTE Electric
Derivative assets
Derivative assets, net	0	0
Recurring | Level 2 | Cash equivalents
Assets:
Nuclear decommissioning trusts	0	0
Other investments	0	0
Recurring | Level 2 | Cash equivalents | DTE Electric
Assets:
Nuclear decommissioning trusts	0	0
Recurring | Level 2 | Equity securities
Assets:
Nuclear decommissioning trusts	0	0
Other investments	0	0
Recurring | Level 2 | Equity securities | DTE Electric
Assets:
Nuclear decommissioning trusts	0	0
Other investments	0	0
Recurring | Level 2 | Fixed income securities
Assets:
Nuclear decommissioning trusts	474	414
Other investments	0	0
Recurring | Level 2 | Fixed income securities | DTE Electric
Assets:
Nuclear decommissioning trusts	474	414
Recurring | Level 3
Assets:
Cash equivalents	0	0
Derivative assets
Derivative assets, gross	113	94
Total assets	113	94
Derivative liabilities
Derivative liabilities, gross	(106)	(182)
Net Assets (Liabilities) at the end of the period	7	(88)
Recurring | Level 3 | DTE Electric
Assets:
Cash equivalents	0	0
Derivative assets
Total assets	4	2
Recurring | Level 3 | Current assets
Derivative assets
Total assets	61	60
Recurring | Level 3 | Current assets | DTE Electric
Derivative assets
Total assets	4	2
Recurring | Level 3 | Noncurrent assets
Derivative assets
Total assets	52	34
Recurring | Level 3 | Noncurrent assets | DTE Electric
Derivative assets
Total assets	0	0
Recurring | Level 3 | Current derivative liabilities
Derivative liabilities
Derivative liabilities, gross	(54)	(79)
Recurring | Level 3 | Noncurrent derivative liabilities
Derivative liabilities
Derivative liabilities, gross	(52)	(103)
Recurring | Level 3 | Natural Gas
Derivative assets
Derivative assets, gross	62	53
Derivative liabilities
Derivative liabilities, gross	(64)	(149)
Recurring | Level 3 | Electricity
Derivative assets
Derivative assets, gross	47	39
Derivative liabilities
Derivative liabilities, gross	(40)	(30)
Recurring | Level 3 | Other
Derivative assets
Derivative assets, gross	4	2
Derivative liabilities
Derivative liabilities, gross	(2)	(3)
Recurring | Level 3 | Foreign currency exchange contracts
Derivative assets
Derivative assets, gross	0	0
Derivative liabilities
Derivative liabilities, gross	0	0
Recurring | Level 3 | Derivative assets — FTRs | DTE Electric
Derivative assets
Derivative assets, net	4	2
Recurring | Level 3 | Cash equivalents
Assets:
Nuclear decommissioning trusts	0	0
Other investments	0	0
Recurring | Level 3 | Cash equivalents | DTE Electric
Assets:
Nuclear decommissioning trusts	0	0
Recurring | Level 3 | Equity securities
Assets:
Nuclear decommissioning trusts	0	0
Other investments	0	0
Recurring | Level 3 | Equity securities | DTE Electric
Assets:
Nuclear decommissioning trusts	0	0
Other investments	0	0
Recurring | Level 3 | Fixed income securities
Assets:
Nuclear decommissioning trusts	0	0
Other investments	0	0
Recurring | Level 3 | Fixed income securities | DTE Electric
Assets:
Nuclear decommissioning trusts	$ 0	$ 0