Fair Value (Assets and Liabilities Recorded at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Derivative Asset [Abstract]
Derivative Assets	$ 549	$ 711
Derivative asset, netting	(468)	(528)
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	81	183
Liabilities [Abstract]
Derivative Liabilities	(656)	(705)
Derivative liability, netting	489	562
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	(167)	(143)
Current liability
Liabilities [Abstract]
Derivative Liabilities	(493)	(521)
Noncurrent liability
Liabilities [Abstract]
Derivative Liabilities	(163)	(184)
Natural Gas
Derivative Asset [Abstract]
Derivative Assets	348	387
Derivative asset, netting	(306)	(285)
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	42	102
Liabilities [Abstract]
Derivative Liabilities	(461)	(383)
Derivative liability, netting	321	294
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	(140)	(89)
Electricity
Derivative Asset [Abstract]
Derivative Assets	193	307
Derivative asset, netting	(157)	(232)
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	36	75
Liabilities [Abstract]
Derivative Liabilities	(189)	(305)
Derivative liability, netting	163	253
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	(26)	(52)
Other
Derivative Asset [Abstract]
Derivative Assets	2	5
Derivative asset, netting	0	(2)
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	2	3
Liabilities [Abstract]
Derivative Liabilities	(3)	(10)
Derivative liability, netting	2	8
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	(1)	(2)
Foreign currency exchange contracts
Derivative Asset [Abstract]
Derivative Assets	6	12
Derivative asset, netting	(5)	(9)
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	1	3
Liabilities [Abstract]
Derivative Liabilities	(3)	(7)
Derivative liability, netting	3	7
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	0	0
Recurring
Assets [Abstract]
Cash and cash equivalents	17	16
Nuclear decommissioning trusts	1,320	1,236
Alternative investments, fair value disclosure	0	4
Other Investments	165	149
Derivative Asset [Abstract]
Derivative asset, netting	(468)	(528)
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	81	183
Total assets	1,583	1,584
Liabilities [Abstract]
Derivative liability, netting	489	562
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	(167)	(143)
Net Assets (Liabilities) at the end of the period	1,416	1,441
Net Assets (Liabilities) at the end of the period, netting	21	34
Recurring | Current asset
Derivative Asset [Abstract]
Derivative asset, netting	(400)	(441)
Total assets	64	145
Recurring | Noncurrent asset
Assets [Abstract]
Alternative investments, fair value disclosure	0	4
Derivative Asset [Abstract]
Derivative asset, netting	(68)	(87)
Total assets	1,519	1,439
Recurring | Current liability
Liabilities [Abstract]
Derivative liability, netting	424	464
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	(69)	(57)
Recurring | Noncurrent liability
Liabilities [Abstract]
Derivative liability, netting	65	98
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	(98)	(86)
Recurring | Restricted assets
Assets [Abstract]
Cash and cash equivalents	7	8
Recurring | Other Investments
Assets [Abstract]
Cash and cash equivalents	10	8
Recurring | Natural Gas
Derivative Asset [Abstract]
Derivative asset, netting	(306)	(285)
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	42	102
Liabilities [Abstract]
Derivative liability, netting	321	294
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	(140)	(89)
Recurring | Electricity
Derivative Asset [Abstract]
Derivative asset, netting	(157)	(232)
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	36	75
Liabilities [Abstract]
Derivative liability, netting	163	253
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	(26)	(52)
Recurring | Other
Derivative Asset [Abstract]
Derivative asset, netting	0	(2)
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	2	3
Liabilities [Abstract]
Derivative liability, netting	2	8
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	(1)	(2)
Recurring | Foreign currency exchange contracts
Derivative Asset [Abstract]
Derivative asset, netting	(5)	(9)
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	1	3
Liabilities [Abstract]
Derivative liability, netting	3	7
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	0	0
Recurring | Level 1
Assets [Abstract]
Cash and cash equivalents	14	13
Nuclear decommissioning trusts	906	759
Other Investments	165	149
Derivative Asset [Abstract]
Derivative Assets	216	195
Total assets	1,301	1,116
Liabilities [Abstract]
Derivative Liabilities	(226)	(220)
Net Assets (Liabilities) at the end of the period	1,075	896
Recurring | Level 1 | Current asset
Derivative Asset [Abstract]
Total assets	205	174
Recurring | Level 1 | Noncurrent asset
Derivative Asset [Abstract]
Total assets	1,096	942
Recurring | Level 1 | Current liability
Liabilities [Abstract]
Derivative Liabilities	(203)	(174)
Recurring | Level 1 | Noncurrent liability
Liabilities [Abstract]
Derivative Liabilities	(23)	(46)
Recurring | Level 1 | Natural Gas
Derivative Asset [Abstract]
Derivative Assets	216	193
Liabilities [Abstract]
Derivative Liabilities	(226)	(218)
Recurring | Level 1 | Electricity
Derivative Asset [Abstract]
Derivative Assets	0	0
Liabilities [Abstract]
Derivative Liabilities	0	0
Recurring | Level 1 | Other
Derivative Asset [Abstract]
Derivative Assets	0	2
Liabilities [Abstract]
Derivative Liabilities	0	(2)
Recurring | Level 1 | Foreign currency exchange contracts
Derivative Asset [Abstract]
Derivative Assets	0	0
Liabilities [Abstract]
Derivative Liabilities	0	0
Recurring | Level 2
Assets [Abstract]
Cash and cash equivalents	3	3
Nuclear decommissioning trusts	414	473
Other Investments	0	0
Derivative Asset [Abstract]
Derivative Assets	239	342
Total assets	656	818
Liabilities [Abstract]
Derivative Liabilities	(248)	(307)
Net Assets (Liabilities) at the end of the period	408	511
Recurring | Level 2 | Current asset
Derivative Asset [Abstract]
Total assets	199	284
Recurring | Level 2 | Noncurrent asset
Derivative Asset [Abstract]
Total assets	457	534
Recurring | Level 2 | Current liability
Liabilities [Abstract]
Derivative Liabilities	(211)	(260)
Recurring | Level 2 | Noncurrent liability
Liabilities [Abstract]
Derivative Liabilities	(37)	(47)
Recurring | Level 2 | Natural Gas
Derivative Asset [Abstract]
Derivative Assets	79	91
Liabilities [Abstract]
Derivative Liabilities	(86)	(57)
Recurring | Level 2 | Electricity
Derivative Asset [Abstract]
Derivative Assets	154	239
Liabilities [Abstract]
Derivative Liabilities	(159)	(243)
Recurring | Level 2 | Other
Derivative Asset [Abstract]
Derivative Assets	0	0
Liabilities [Abstract]
Derivative Liabilities	0	0
Recurring | Level 2 | Foreign currency exchange contracts
Derivative Asset [Abstract]
Derivative Assets	6	12
Liabilities [Abstract]
Derivative Liabilities	(3)	(7)
Recurring | Level 3
Assets [Abstract]
Cash and cash equivalents	0	0
Nuclear decommissioning trusts	0	0
Other Investments	0	0
Derivative Asset [Abstract]
Derivative Assets	94	174
Total assets	94	174
Liabilities [Abstract]
Derivative Liabilities	(182)	(178)
Net Assets (Liabilities) at the end of the period	(88)	(4)
Recurring | Level 3 | Current asset
Derivative Asset [Abstract]
Total assets	60	128
Recurring | Level 3 | Noncurrent asset
Derivative Asset [Abstract]
Total assets	34	46
Recurring | Level 3 | Current liability
Liabilities [Abstract]
Derivative Liabilities	(79)	(87)
Recurring | Level 3 | Noncurrent liability
Liabilities [Abstract]
Derivative Liabilities	(103)	(91)
Recurring | Level 3 | Natural Gas
Derivative Asset [Abstract]
Derivative Assets	53	103
Liabilities [Abstract]
Derivative Liabilities	(149)	(108)
Recurring | Level 3 | Electricity
Derivative Asset [Abstract]
Derivative Assets	39	68
Liabilities [Abstract]
Derivative Liabilities	(30)	(62)
Recurring | Level 3 | Other
Derivative Asset [Abstract]
Derivative Assets	2	3
Liabilities [Abstract]
Derivative Liabilities	(3)	(8)
Recurring | Level 3 | Foreign currency exchange contracts
Derivative Asset [Abstract]
Derivative Assets	0	0
Liabilities [Abstract]
Derivative Liabilities	0	0
DTE Electric
Assets [Abstract]
Nuclear decommissioning trusts	1,320	1,236
DTE Electric | Recurring
Assets [Abstract]
Cash and cash equivalents	11	8
Nuclear decommissioning trusts	1,320	1,236
Alternative investments, fair value disclosure	0	4
Other Investments	9	8
Derivative Asset [Abstract]
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position	2	3
Total assets	1,342	1,255
DTE Electric | Recurring | Current asset
Derivative Asset [Abstract]
Total assets	13	11
DTE Electric | Recurring | Noncurrent asset
Assets [Abstract]
Alternative investments, fair value disclosure	0	4
Derivative Asset [Abstract]
Total assets	1,329	1,244
DTE Electric | Recurring | Level 1
Assets [Abstract]
Cash and cash equivalents	8	5
Nuclear decommissioning trusts	906	759
Other Investments	9	8
Derivative Asset [Abstract]
Derivative Assets	0	0
Total assets	923	772
DTE Electric | Recurring | Level 1 | Current asset
Derivative Asset [Abstract]
Total assets	8	5
DTE Electric | Recurring | Level 1 | Noncurrent asset
Derivative Asset [Abstract]
Total assets	915	767
DTE Electric | Recurring | Level 2
Assets [Abstract]
Cash and cash equivalents	3	3
Nuclear decommissioning trusts	414	473
Other Investments	0	0
Derivative Asset [Abstract]
Derivative Assets	0	0
Total assets	417	476
DTE Electric | Recurring | Level 2 | Current asset
Derivative Asset [Abstract]
Total assets	3	3
DTE Electric | Recurring | Level 2 | Noncurrent asset
Derivative Asset [Abstract]
Total assets	414	473
DTE Electric | Recurring | Level 3
Assets [Abstract]
Cash and cash equivalents	0	0
Nuclear decommissioning trusts	0	0
Other Investments	0	0
Derivative Asset [Abstract]
Derivative Assets	2	3
Total assets	2	3
DTE Electric | Recurring | Level 3 | Current asset
Derivative Asset [Abstract]
Total assets	2	3
DTE Electric | Recurring | Level 3 | Noncurrent asset
Derivative Asset [Abstract]
Total assets	0	0
Nuclear decommissioning trusts | Recurring
Assets [Abstract]
Alternative investments, fair value disclosure	0	4
Nuclear decommissioning trusts | DTE Electric | Recurring
Assets [Abstract]
Alternative investments, fair value disclosure	$ 0	$ 4