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Financial and Other Derivative Instruments (Tables)
 12 Months Ended
Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Fair Value of Derivative Instruments
The following table presents the fair value of derivative instruments as of December 31, 2017 and 2016 for DTE Energy:
 
December 31, 2017
 
December 31, 2016
 
Derivative
Assets
 
Derivative
Liabilities
 
Derivative
Assets
 
Derivative
Liabilities
 
(In millions)
Derivatives not designated as hedging instruments:
 
 
 
 
 
 
 
Commodity Contracts:
 
 
 
 
 

 
 

Natural Gas
$
357

 
$
(378
)
 
$
348

 
$
(461
)
Electricity
285

 
(275
)
 
193

 
(189
)
Other
9

 
(1
)
 
2

 
(3
)
Foreign currency exchange contracts
1

 
(3
)
 
6

 
(3
)
Total derivatives not designated as hedging instrument
$
652

 
$
(657
)
 
$
549

 
$
(656
)
 
 
 
 
 
 
 
 
Current
$
540

 
$
(558
)
 
$
447

 
$
(493
)
Noncurrent
112

 
(99
)
 
102

 
(163
)
Total derivatives
$
652

 
$
(657
)
 
$
549

 
$
(656
)

The following table presents the fair value of derivative instruments as of December 31, 2017 and 2016 for DTE Electric:
 
December 31,
 
2017
 
2016
 
(In millions)
FTRs — Other current assets
$
9

 
$
2

Total derivatives not designated as hedging instruments
$
9

 
$
2
Offsetting Assets
The following table presents the netting offsets of Derivative assets and liabilities for DTE Energy at December 31, 2017 and 2016:
 
December 31, 2017
 
December 31, 2016
 
Gross Amounts of Recognized Assets (Liabilities)
 
Gross Amounts Offset in the Consolidated Statements of Financial Position
 
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position
 
Gross Amounts of Recognized Assets (Liabilities)
 
Gross Amounts Offset in the Consolidated Statements of Financial Position
 
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position
 
(In millions)
Derivative assets:
 
 
 
 
 
 
 
 
 
 
 
Commodity Contracts:
 
 
 
 
 
 
 
 
 
 
 
Natural Gas
$
357

 
$
(256
)
 
$
101

 
$
348

 
$
(306
)
 
$
42

Electricity
285

 
(241
)
 
44

 
193

 
(157
)
 
36

Other
9

 
—

 
9

 
2

 
—

 
2

Foreign currency exchange contracts
1

 
(1
)
 
—

 
6

 
(5
)
 
1

Total derivative assets
$
652

 
$
(498
)
 
$
154

 
$
549

 
$
(468
)
 
$
81

 
 
 
 
 
 
 
 
 
 
 
 
Derivative liabilities:
 
 
 
 
 
 
 
 
 
 
 
Commodity Contracts:
 
 
 
 
 
 
 
 
 
 
 
Natural Gas
$
(378
)
 
$
263

 
$
(115
)
 
$
(461
)
 
$
321

 
$
(140
)
Electricity
(275
)
 
246

 
(29
)
 
(189
)
 
163

 
(26
)
Other
(1
)
 
1

 
—

 
(3
)
 
2

 
(1
)
Foreign currency exchange contracts
(3
)
 
1

 
(2
)
 
(3
)
 
3

 
—

Total derivative liabilities
$
(657
)
 
$
511

 
$
(146
)
 
$
(656
)
 
$
489

 
$
(167
)
Offsetting Liabilities
The following table presents the netting offsets of Derivative assets and liabilities for DTE Energy at December 31, 2017 and 2016:
 
December 31, 2017
 
December 31, 2016
 
Gross Amounts of Recognized Assets (Liabilities)
 
Gross Amounts Offset in the Consolidated Statements of Financial Position
 
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position
 
Gross Amounts of Recognized Assets (Liabilities)
 
Gross Amounts Offset in the Consolidated Statements of Financial Position
 
Net Amounts of Assets (Liabilities) Presented in the Consolidated Statements of Financial Position
 
(In millions)
Derivative assets:
 
 
 
 
 
 
 
 
 
 
 
Commodity Contracts:
 
 
 
 
 
 
 
 
 
 
 
Natural Gas
$
357

 
$
(256
)
 
$
101

 
$
348

 
$
(306
)
 
$
42

Electricity
285

 
(241
)
 
44

 
193

 
(157
)
 
36

Other
9

 
—

 
9

 
2

 
—

 
2

Foreign currency exchange contracts
1

 
(1
)
 
—

 
6

 
(5
)
 
1

Total derivative assets
$
652

 
$
(498
)
 
$
154

 
$
549

 
$
(468
)
 
$
81

 
 
 
 
 
 
 
 
 
 
 
 
Derivative liabilities:
 
 
 
 
 
 
 
 
 
 
 
Commodity Contracts:
 
 
 
 
 
 
 
 
 
 
 
Natural Gas
$
(378
)
 
$
263

 
$
(115
)
 
$
(461
)
 
$
321

 
$
(140
)
Electricity
(275
)
 
246

 
(29
)
 
(189
)
 
163

 
(26
)
Other
(1
)
 
1

 
—

 
(3
)
 
2

 
(1
)
Foreign currency exchange contracts
(3
)
 
1

 
(2
)
 
(3
)
 
3

 
—

Total derivative liabilities
$
(657
)
 
$
511

 
$
(146
)
 
$
(656
)
 
$
489

 
$
(167
)
Netting Offsets of Derivative Assets and Liabilities Reconciliation to the Statements of Financial Position
The following table presents the netting offsets of Derivative assets and liabilities showing the reconciliation of derivative instruments to DTE Energy's Consolidated Statements of Financial Position at December 31, 2017 and 2016:
 
December 31, 2017
 
December 31, 2016
 
Derivative Assets
 
Derivative Liabilities
 
Derivative Assets
 
Derivative Liabilities
 
Current
 
Noncurrent
 
Current
 
Noncurrent
 
Current
 
Noncurrent
 
Current
 
Noncurrent
 
(In millions)
Total fair value of derivatives
$
540

 
$
112

 
$
(558
)
 
$
(99
)
 
$
447

 
$
102

 
$
(493
)
 
$
(163
)
Counterparty netting
(437
)
 
(52
)
 
437

 
52

 
(396
)
 
(65
)
 
396

 
65

Collateral adjustment
—

 
(9
)
 
22

 
—

 
(4
)
 
(3
)
 
28

 
—

Total derivatives as reported
$
103

 
$
51

 
$
(99
)
 
$
(47
)
 
$
47

 
$
34

 
$
(69
)
 
$
(98
)
Gain (Loss) Recognized in Income on Derivatives
The effect of derivatives not designated as hedging instruments on DTE Energy's Consolidated Statements of Operations for years ended December 31, 2017 and 2016 is as follows:
 
 
Location of Gain (Loss) Recognized in Income on Derivatives
 
Gain (Loss) Recognized in Income on Derivatives for Years Ended December 31,
Derivatives not Designated as Hedging Instruments
 
 
2017
 
2016
 
 
 
 
(In millions)
Commodity Contracts:
 
 
 
 
 
 
Natural Gas
 
Operating Revenues — Non-utility operations
 
$
(74
)
 
$
(153
)
Natural Gas
 
Fuel, purchased power, and gas — non-utility
 
97

 
(2
)
Electricity
 
Operating Revenues — Non-utility operations
 
105

 
43

Other
 
Operating Revenues — Non-utility operations
 
2

 
5

Foreign currency exchange contracts
 
Operating Revenues — Non-utility operations
 
(2
)
 
(2
)
Total
 
 
 
$
128

 
$
(109
)
Volume of Commodity Contracts
The following represents the cumulative gross volume of DTE Energy's derivative contracts outstanding as of December 31, 2017:
Commodity
 
Number of Units
Natural Gas (MMBtu)
 
1,822,796,301

Electricity (MWh)
 
29,715,268

Foreign Currency Exchange (Canadian dollars)
 
108,023,948