Fair Value (Assets and Liabilities Recorded at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Assets:
Decommissioning fund outstanding commitments	$ 15
Derivative assets
Derivative assets, gross	503	$ 549
Derivative asset, netting	(364)	(468)
Derivative assets, net	139	81
Derivative liabilities
Derivative liabilities, gross	(489)	(656)
Derivative liability, netting	387	489
Derivative liabilities, net	(102)	(167)
DTE Electric
Assets:
Decommissioning fund outstanding commitments	15
Current derivative liabilities
Derivative liabilities
Derivative liabilities, gross	(334)	(493)
Noncurrent derivative liabilities
Derivative liabilities
Derivative liabilities, gross	(155)	(163)
Natural Gas
Derivative assets
Derivative assets, gross	226	348
Derivative asset, netting	(155)	(306)
Derivative assets, net	71	42
Derivative liabilities
Derivative liabilities, gross	(216)	(461)
Derivative liability, netting	156	321
Derivative liabilities, net	(60)	(140)
Electricity
Derivative assets
Derivative assets, gross	266	193
Derivative asset, netting	(207)	(157)
Derivative assets, net	59	36
Derivative liabilities
Derivative liabilities, gross	(268)	(189)
Derivative liability, netting	227	163
Derivative liabilities, net	(41)	(26)
Other
Derivative assets
Derivative assets, gross	8	2
Derivative asset, netting	0	0
Derivative assets, net	8	2
Derivative liabilities
Derivative liabilities, gross	(3)	(3)
Derivative liability, netting	3	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	(2)	(3)
Derivative liability, netting	1	3
Derivative liabilities, net	(1)	0
Recurring
Assets:
Cash equivalents	18	17
Derivative assets
Derivative asset, netting	(364)	(468)
Derivative assets, net	139	81
Total assets	1,728	1,583
Derivative liabilities
Derivative liability, netting	387	489
Derivative liabilities, net	(102)	(167)
Net Assets (Liabilities) at the end of the period	1,626	1,416
Net Assets (Liabilities) at the end of the period, netting	23	21
Recurring | DTE Electric
Assets:
Cash equivalents	11	11
Derivative assets
Total assets	1,420	1,342
Recurring | Current assets
Derivative assets
Derivative asset, netting	(274)	(400)
Total assets	99	64
Recurring | Current assets | DTE Electric
Derivative assets
Total assets	19	13
Recurring | Noncurrent assets
Derivative assets
Derivative asset, netting	(90)	(68)
Total assets	1,629	1,519
Recurring | Noncurrent assets | DTE Electric
Derivative assets
Total assets	1,401	1,329
Recurring | Current derivative liabilities
Derivative liabilities
Derivative liability, netting	295	424
Derivative liabilities, net	(39)	(69)
Recurring | Noncurrent derivative liabilities
Derivative liabilities
Derivative liability, netting	92	65
Derivative liabilities, net	(63)	(98)
Recurring | Restricted assets
Assets:
Cash equivalents	7	7
Recurring | Other investments
Assets:
Cash equivalents	11	10
Recurring | Other investments | DTE Electric
Assets:
Cash equivalents	11	11
Recurring | Natural Gas
Derivative assets
Derivative asset, netting	(155)	(306)
Derivative assets, net	71	42
Derivative liabilities
Derivative liability, netting	156	321
Derivative liabilities, net	(60)	(140)
Recurring | Electricity
Derivative assets
Derivative asset, netting	(207)	(157)
Derivative assets, net	59	36
Derivative liabilities
Derivative liability, netting	227	163
Derivative liabilities, net	(41)	(26)
Recurring | Other
Derivative assets
Derivative asset, netting	0	0
Derivative assets, net	8	2
Derivative liabilities
Derivative liability, netting	3	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	1	3
Derivative liabilities, net	(1)	0
Recurring | Derivative assets — FTRs | DTE Electric
Derivative assets
Derivative assets, net	8	2
Recurring | Equity securities
Assets:
Nuclear decommissioning trusts	911	887
Other investments	114	104
Recurring | Equity securities | DTE Electric
Assets:
Nuclear decommissioning trusts	911	887
Other investments	9	9
Recurring | Fixed income securities
Assets:
Nuclear decommissioning trusts	479	425
Other investments	65	61
Recurring | Fixed income securities | DTE Electric
Assets:
Nuclear decommissioning trusts	479	425
Recurring | Cash equivalents
Assets:
Nuclear decommissioning trusts	2	8
Recurring | Cash equivalents | DTE Electric
Assets:
Nuclear decommissioning trusts	2	8
Recurring | Level 1
Assets:
Cash equivalents	15	14
Derivative assets
Derivative assets, gross	74	216
Total assets	1,190	1,301
Derivative liabilities
Derivative liabilities, gross	(74)	(226)
Net Assets (Liabilities) at the end of the period	1,116	1,075
Recurring | Level 1 | DTE Electric
Assets:
Cash equivalents	8	8
Derivative assets
Total assets	939	923
Recurring | Level 1 | Current assets
Derivative assets
Total assets	74	205
Recurring | Level 1 | Current assets | DTE Electric
Derivative assets
Total assets	8	8
Recurring | Level 1 | Noncurrent assets
Derivative assets
Total assets	1,116	1,096
Recurring | Level 1 | Noncurrent assets | DTE Electric
Derivative assets
Total assets	931	915
Recurring | Level 1 | Current derivative liabilities
Derivative liabilities
Derivative liabilities, gross	(61)	(203)
Recurring | Level 1 | Noncurrent derivative liabilities
Derivative liabilities
Derivative liabilities, gross	(13)	(23)
Recurring | Level 1 | Natural Gas
Derivative assets
Derivative assets, gross	74	216
Derivative liabilities
Derivative liabilities, gross	(74)	(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 | Equity securities
Assets:
Nuclear decommissioning trusts	911	887
Other investments	114	104
Recurring | Level 1 | Equity securities | DTE Electric
Assets:
Nuclear decommissioning trusts	911	887
Other investments	9	9
Recurring | Level 1 | Fixed income securities
Assets:
Nuclear decommissioning trusts	9	11
Other investments	65	61
Recurring | Level 1 | Fixed income securities | DTE Electric
Assets:
Nuclear decommissioning trusts	9	11
Recurring | Level 1 | Cash equivalents
Assets:
Nuclear decommissioning trusts	2	8
Recurring | Level 1 | Cash equivalents | DTE Electric
Assets:
Nuclear decommissioning trusts	2	8
Recurring | Level 2
Assets:
Cash equivalents	3	3
Derivative assets
Derivative assets, gross	305	239
Total assets	778	656
Derivative liabilities
Derivative liabilities, gross	(285)	(248)
Net Assets (Liabilities) at the end of the period	493	408
Recurring | Level 2 | DTE Electric
Assets:
Cash equivalents	3	3
Derivative assets
Total assets	473	417
Recurring | Level 2 | Current assets
Derivative assets
Total assets	225	199
Recurring | Level 2 | Current assets | DTE Electric
Derivative assets
Total assets	3	3
Recurring | Level 2 | Noncurrent assets
Derivative assets
Total assets	553	457
Recurring | Level 2 | Noncurrent assets | DTE Electric
Derivative assets
Total assets	470	414
Recurring | Level 2 | Current derivative liabilities
Derivative liabilities
Derivative liabilities, gross	(215)	(211)
Recurring | Level 2 | Noncurrent derivative liabilities
Derivative liabilities
Derivative liabilities, gross	(70)	(37)
Recurring | Level 2 | Natural Gas
Derivative assets
Derivative assets, gross	96	79
Derivative liabilities
Derivative liabilities, gross	(69)	(86)
Recurring | Level 2 | Electricity
Derivative assets
Derivative assets, gross	206	154
Derivative liabilities
Derivative liabilities, gross	(214)	(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	(2)	(3)
Recurring | Level 2 | Derivative assets — FTRs | DTE Electric
Derivative assets
Derivative assets, net	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	470	414
Other investments	0	0
Recurring | Level 2 | Fixed income securities | DTE Electric
Assets:
Nuclear decommissioning trusts	470	414
Recurring | Level 2 | Cash equivalents
Assets:
Nuclear decommissioning trusts	0	0
Recurring | Level 2 | Cash equivalents | DTE Electric
Assets:
Nuclear decommissioning trusts	0	0
Recurring | Level 3
Assets:
Cash equivalents	0	0
Derivative assets
Derivative assets, gross	124	94
Total assets	124	94
Derivative liabilities
Derivative liabilities, gross	(130)	(182)
Net Assets (Liabilities) at the end of the period	(6)	(88)
Recurring | Level 3 | DTE Electric
Assets:
Cash equivalents	0	0
Derivative assets
Total assets	8	2
Recurring | Level 3 | Current assets
Derivative assets
Total assets	74	60
Recurring | Level 3 | Current assets | DTE Electric
Derivative assets
Total assets	8	2
Recurring | Level 3 | Noncurrent assets
Derivative assets
Total assets	50	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	(58)	(79)
Recurring | Level 3 | Noncurrent derivative liabilities
Derivative liabilities
Derivative liabilities, gross	(72)	(103)
Recurring | Level 3 | Natural Gas
Derivative assets
Derivative assets, gross	56	53
Derivative liabilities
Derivative liabilities, gross	(73)	(149)
Recurring | Level 3 | Electricity
Derivative assets
Derivative assets, gross	60	39
Derivative liabilities
Derivative liabilities, gross	(54)	(30)
Recurring | Level 3 | Other
Derivative assets
Derivative assets, gross	8	2
Derivative liabilities
Derivative liabilities, gross	(3)	(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	8	2
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
Recurring | Level 3 | Cash equivalents
Assets:
Nuclear decommissioning trusts	0	0
Recurring | Level 3 | Cash equivalents | DTE Electric
Assets:
Nuclear decommissioning trusts	$ 0	$ 0