Fair Value (Assets and Liabilities Recorded at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
ASSETS
Decommissioning fund outstanding commitments	$ 15
Derivative Assets
Derivative assets, gross	496	$ 549
Derivative asset, netting	(355)	(468)
Derivative assets, net	141	81
Derivative Liabilities
Derivative liabilities, gross	(491)	(656)
Derivative liability, netting	365	489
Derivative liabilities, net	(126)	(167)
Current derivative liabilities
Derivative Liabilities
Derivative liabilities, gross	(312)	(493)
Noncurrent derivative liabilities
Derivative Liabilities
Derivative liabilities, gross	(179)	(163)
Natural Gas
Derivative Assets
Derivative assets, gross	304	348
Derivative asset, netting	(206)	(306)
Derivative assets, net	98	42
Derivative Liabilities
Derivative liabilities, gross	(289)	(461)
Derivative liability, netting	202	321
Derivative liabilities, net	(87)	(140)
Electricity
Derivative Assets
Derivative assets, gross	186	193
Derivative asset, netting	(146)	(157)
Derivative assets, net	40	36
Derivative Liabilities
Derivative liabilities, gross	(197)	(189)
Derivative liability, netting	158	163
Derivative liabilities, net	(39)	(26)
Other
Derivative Assets
Derivative assets, gross	1	2
Derivative asset, netting	0	0
Derivative assets, net	1	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	5	6
Derivative asset, netting	(3)	(5)
Derivative assets, net	2	1
Derivative Liabilities
Derivative liabilities, gross	(2)	(3)
Derivative liability, netting	2	3
Derivative liabilities, net	0	0
Recurring
ASSETS
Cash equivalents	17	17
Derivative Assets
Derivative asset, netting	(355)	(468)
Derivative assets, net	141	81
Total assets	1,695	1,583
Derivative Liabilities
Derivative liability, netting	365	489
Derivative liabilities, net	(126)	(167)
Net Assets (Liabilities) at the end of the period	1,569	1,416
Net Assets (Liabilities) at the end of the period, netting	10	21
Recurring | Current assets
Derivative Assets
Derivative asset, netting	(281)	(400)
Total assets	85	64
Recurring | Noncurrent assets
Derivative Assets
Derivative asset, netting	(74)	(68)
Total assets	1,610	1,519
Recurring | Current derivative liabilities
Derivative Liabilities
Derivative liability, netting	279	424
Derivative liabilities, net	(33)	(69)
Recurring | Noncurrent derivative liabilities
Derivative Liabilities
Derivative liability, netting	86	65
Derivative liabilities, net	(93)	(98)
Recurring | Restricted assets
ASSETS
Cash equivalents	7	7
Recurring | Other investments
ASSETS
Cash equivalents	10	10
Recurring | Natural Gas
Derivative Assets
Derivative asset, netting	(206)	(306)
Derivative assets, net	98	42
Derivative Liabilities
Derivative liability, netting	202	321
Derivative liabilities, net	(87)	(140)
Recurring | Electricity
Derivative Assets
Derivative asset, netting	(146)	(157)
Derivative assets, net	40	36
Derivative Liabilities
Derivative liability, netting	158	163
Derivative liabilities, net	(39)	(26)
Recurring | Other
Derivative Assets
Derivative asset, netting	0	0
Derivative assets, net	1	2
Derivative Liabilities
Derivative liability, netting	3	2
Derivative liabilities, net	0	(1)
Recurring | Foreign currency exchange contracts
Derivative Assets
Derivative asset, netting	(3)	(5)
Derivative assets, net	2	1
Derivative Liabilities
Derivative liability, netting	2	3
Derivative liabilities, net	0	0
Recurring | Level 1
ASSETS
Cash equivalents	14	14
Derivative Assets
Derivative assets, gross	82	216
Total assets	1,173	1,301
Derivative Liabilities
Derivative liabilities, gross	(82)	(226)
Net Assets (Liabilities) at the end of the period	1,091	1,075
Recurring | Level 1 | Current assets
Derivative Assets
Total assets	78	205
Recurring | Level 1 | Noncurrent assets
Derivative Assets
Total assets	1,095	1,096
Recurring | Level 1 | Current derivative liabilities
Derivative Liabilities
Derivative liabilities, gross	(63)	(203)
Recurring | Level 1 | Noncurrent derivative liabilities
Derivative Liabilities
Derivative liabilities, gross	(19)	(23)
Recurring | Level 1 | Natural Gas
Derivative Assets
Derivative assets, gross	82	216
Derivative Liabilities
Derivative liabilities, gross	(82)	(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 2
ASSETS
Cash equivalents	3	3
Derivative Assets
Derivative assets, gross	308	239
Total assets	771	656
Derivative Liabilities
Derivative liabilities, gross	(280)	(248)
Net Assets (Liabilities) at the end of the period	491	408
Recurring | Level 2 | Current assets
Derivative Assets
Total assets	228	199
Recurring | Level 2 | Noncurrent assets
Derivative Assets
Total assets	543	457
Recurring | Level 2 | Current derivative liabilities
Derivative Liabilities
Derivative liabilities, gross	(213)	(211)
Recurring | Level 2 | Noncurrent derivative liabilities
Derivative Liabilities
Derivative liabilities, gross	(67)	(37)
Recurring | Level 2 | Natural Gas
Derivative Assets
Derivative assets, gross	151	79
Derivative Liabilities
Derivative liabilities, gross	(121)	(86)
Recurring | Level 2 | Electricity
Derivative Assets
Derivative assets, gross	152	154
Derivative Liabilities
Derivative liabilities, gross	(157)	(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	5	6
Derivative Liabilities
Derivative liabilities, gross	(2)	(3)
Recurring | Level 3
ASSETS
Cash equivalents	0	0
Derivative Assets
Derivative assets, gross	106	94
Total assets	106	94
Derivative Liabilities
Derivative liabilities, gross	(129)	(182)
Net Assets (Liabilities) at the end of the period	(23)	(88)
Recurring | Level 3 | Current assets
Derivative Assets
Total assets	60	60
Recurring | Level 3 | Noncurrent assets
Derivative Assets
Total assets	46	34
Recurring | Level 3 | Current derivative liabilities
Derivative Liabilities
Derivative liabilities, gross	(36)	(79)
Recurring | Level 3 | Noncurrent derivative liabilities
Derivative Liabilities
Derivative liabilities, gross	(93)	(103)
Recurring | Level 3 | Natural Gas
Derivative Assets
Derivative assets, gross	71	53
Derivative Liabilities
Derivative liabilities, gross	(86)	(149)
Recurring | Level 3 | Electricity
Derivative Assets
Derivative assets, gross	34	39
Derivative Liabilities
Derivative liabilities, gross	(40)	(30)
Recurring | Level 3 | Other
Derivative Assets
Derivative assets, gross	1	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
DTE Electric
ASSETS
Decommissioning fund outstanding commitments	15
DTE Electric | Recurring
ASSETS
Cash equivalents	11	11
Derivative Assets
Total assets	1,385	1,342
DTE Electric | Recurring | Current assets
Derivative Assets
Total assets	12	13
DTE Electric | Recurring | Noncurrent assets
Derivative Assets
Total assets	1,373	1,329
DTE Electric | Recurring | Other investments
ASSETS
Cash equivalents	11	11
DTE Electric | Recurring | Financial transmission rights
Derivative Assets
Derivative assets, net	1	2
DTE Electric | Recurring | Level 1
ASSETS
Cash equivalents	8	8
Derivative Assets
Total assets	921	923
DTE Electric | Recurring | Level 1 | Current assets
Derivative Assets
Total assets	8	8
DTE Electric | Recurring | Level 1 | Noncurrent assets
Derivative Assets
Total assets	913	915
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
Derivative Assets
Total assets	463	417
DTE Electric | Recurring | Level 2 | Current assets
Derivative Assets
Total assets	3	3
DTE Electric | Recurring | Level 2 | Noncurrent assets
Derivative Assets
Total assets	460	414
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
Derivative Assets
Total assets	1	2
DTE Electric | Recurring | Level 3 | Current assets
Derivative Assets
Total assets	1	2
DTE Electric | Recurring | Level 3 | Noncurrent assets
Derivative Assets
Total assets	0	0
DTE Electric | Recurring | Level 3 | Financial transmission rights
Derivative Assets
Derivative assets, net	1	2
Equity securities | Recurring
ASSETS
Nuclear decommissioning trusts, fair value	890	887
Other investments, fair value	110	104
Equity securities | Recurring | Level 1
ASSETS
Nuclear decommissioning trusts, fair value	890	887
Other investments, fair value	110	104
Equity securities | Recurring | Level 2
ASSETS
Nuclear decommissioning trusts, fair value	0	0
Other investments, fair value	0	0
Equity securities | Recurring | Level 3
ASSETS
Nuclear decommissioning trusts, fair value	0	0
Other investments, fair value	0	0
Equity securities | DTE Electric | Recurring
ASSETS
Nuclear decommissioning trusts, fair value	890	887
Other investments, fair value	9	9
Equity securities | DTE Electric | Recurring | Level 1
ASSETS
Nuclear decommissioning trusts, fair value	890	887
Other investments, fair value	9	9
Equity securities | DTE Electric | Recurring | Level 2
ASSETS
Nuclear decommissioning trusts, fair value	0	0
Other investments, fair value	0	0
Equity securities | DTE Electric | Recurring | Level 3
ASSETS
Nuclear decommissioning trusts, fair value	0	0
Other investments, fair value	0	0
Fixed income securities | Recurring
ASSETS
Nuclear decommissioning trusts, fair value	471	425
Other investments, fair value	63	61
Fixed income securities | Recurring | Level 1
ASSETS
Nuclear decommissioning trusts, fair value	11	11
Other investments, fair value	63	61
Fixed income securities | Recurring | Level 2
ASSETS
Nuclear decommissioning trusts, fair value	460	414
Other investments, fair value	0	0
Fixed income securities | Recurring | Level 3
ASSETS
Nuclear decommissioning trusts, fair value	0	0
Other investments, fair value	0	0
Fixed income securities | DTE Electric | Recurring
ASSETS
Nuclear decommissioning trusts, fair value	471	425
Fixed income securities | DTE Electric | Recurring | Level 1
ASSETS
Nuclear decommissioning trusts, fair value	11	11
Fixed income securities | DTE Electric | Recurring | Level 2
ASSETS
Nuclear decommissioning trusts, fair value	460	414
Fixed income securities | DTE Electric | Recurring | Level 3
ASSETS
Nuclear decommissioning trusts, fair value	0	0
Cash equivalents | Recurring
ASSETS
Nuclear decommissioning trusts, fair value	3	8
Cash equivalents | Recurring | Level 1
ASSETS
Nuclear decommissioning trusts, fair value	3	8
Cash equivalents | Recurring | Level 2
ASSETS
Nuclear decommissioning trusts, fair value	0	0
Cash equivalents | Recurring | Level 3
ASSETS
Nuclear decommissioning trusts, fair value	0	0
Cash equivalents | DTE Electric | Recurring
ASSETS
Nuclear decommissioning trusts, fair value	3	8
Cash equivalents | DTE Electric | Recurring | Level 1
ASSETS
Nuclear decommissioning trusts, fair value	3	8
Cash equivalents | DTE Electric | Recurring | Level 2
ASSETS
Nuclear decommissioning trusts, fair value	0	0
Cash equivalents | DTE Electric | Recurring | Level 3
ASSETS
Nuclear decommissioning trusts, fair value	$ 0	$ 0