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Financial and Other Derivative Instruments (Tables)
 12 Months Ended
Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Fair Value of Derivative Instruments
The following table presents the fair value of derivative instruments for DTE Energy:
 
December 31, 2018
 
December 31, 2017
 
Derivative
Assets
 
Derivative
Liabilities
 
Derivative
Assets
 
Derivative
Liabilities
 
(In millions)
Derivatives designated as hedging instruments
 
 
 
 
 
 
 
Interest rate contracts
$
—

 
$
(3
)
 
$
—

 
$
—

Derivatives not designated as hedging instruments
 
 
 
 
 
 
 
Commodity contracts
 
 
 
 
 
 
 
Natural gas
$
349

 
$
(380
)
 
$
357

 
$
(378
)
Electricity
303

 
(285
)
 
285

 
(275
)
Other
7

 
(1
)
 
9

 
(1
)
Foreign currency exchange contracts
4

 
—

 
1

 
(3
)
Total derivatives not designated as hedging instruments
$
663

 
$
(666
)
 
$
652

 
$
(657
)
 
 
 
 
 
 
 
 
Current
$
563

 
$
(518
)
 
$
540

 
$
(558
)
Noncurrent
100

 
(151
)
 
112

 
(99
)
Total derivatives
$
663

 
$
(669
)
 
$
652

 
$
(657
)

The following table presents the fair value of derivative instruments for DTE Electric:
 
December 31,
 
2018
 
2017
 
(In millions)
FTRs — Other current assets
$
6

 
$
9

Total derivatives not designated as hedging instruments
$
6

 
$
9
Offsetting Assets
The following table presents the netting offsets of Derivative assets and liabilities for DTE Energy:
 
December 31, 2018
 
December 31, 2017
 
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
$
349

 
$
(277
)
 
$
72

 
$
357

 
$
(256
)
 
$
101

Electricity
303

 
(252
)
 
51

 
285

 
(241
)
 
44

Other
7

 
(1
)
 
6

 
9

 
—

 
9

Foreign currency exchange contracts
4

 
—

 
4

 
1

 
(1
)
 
—

Total derivative assets
$
663

 
$
(530
)
 
$
133

 
$
652

 
$
(498
)
 
$
154

 
 
 
 
 
 
 
 
 
 
 
 
Derivative liabilities
 
 
 
 
 
 
 
 
 
 
 
Commodity contracts
 
 
 
 
 
 
 
 
 
 
 
Natural gas
$
(380
)
 
$
272

 
$
(108
)
 
$
(378
)
 
$
263

 
$
(115
)
Electricity
(285
)
 
240

 
(45
)
 
(275
)
 
246

 
(29
)
Other
(1
)
 
1

 
—

 
(1
)
 
1

 
—

Interest rate contracts
(3
)
 
—

 
(3
)
 
—

 
—

 
—

Foreign currency exchange contracts
—

 
—

 
—

 
(3
)
 
1

 
(2
)
Total derivative liabilities
$
(669
)
 
$
513

 
$
(156
)
 
$
(657
)
 
$
511

 
$
(146
)
Offsetting Liabilities
The following table presents the netting offsets of Derivative assets and liabilities for DTE Energy:
 
December 31, 2018
 
December 31, 2017
 
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
$
349

 
$
(277
)
 
$
72

 
$
357

 
$
(256
)
 
$
101

Electricity
303

 
(252
)
 
51

 
285

 
(241
)
 
44

Other
7

 
(1
)
 
6

 
9

 
—

 
9

Foreign currency exchange contracts
4

 
—

 
4

 
1

 
(1
)
 
—

Total derivative assets
$
663

 
$
(530
)
 
$
133

 
$
652

 
$
(498
)
 
$
154

 
 
 
 
 
 
 
 
 
 
 
 
Derivative liabilities
 
 
 
 
 
 
 
 
 
 
 
Commodity contracts
 
 
 
 
 
 
 
 
 
 
 
Natural gas
$
(380
)
 
$
272

 
$
(108
)
 
$
(378
)
 
$
263

 
$
(115
)
Electricity
(285
)
 
240

 
(45
)
 
(275
)
 
246

 
(29
)
Other
(1
)
 
1

 
—

 
(1
)
 
1

 
—

Interest rate contracts
(3
)
 
—

 
(3
)
 
—

 
—

 
—

Foreign currency exchange contracts
—

 
—

 
—

 
(3
)
 
1

 
(2
)
Total derivative liabilities
$
(669
)
 
$
513

 
$
(156
)
 
$
(657
)
 
$
511

 
$
(146
)
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:
 
December 31, 2018
 
December 31, 2017
 
Derivative Assets
 
Derivative Liabilities
 
Derivative Assets
 
Derivative Liabilities
 
Current
 
Noncurrent
 
Current
 
Noncurrent
 
Current
 
Noncurrent
 
Current
 
Noncurrent
 
(In millions)
Total fair value of derivatives
$
563

 
$
100

 
$
(518
)
 
$
(151
)
 
$
540

 
$
112

 
$
(558
)
 
$
(99
)
Counterparty netting
(451
)
 
(62
)
 
451

 
62

 
(437
)
 
(52
)
 
437

 
52

Collateral adjustment
(10
)
 
(7
)
 
—

 
—

 
—

 
(9
)
 
22

 
—

Total derivatives as reported
$
102

 
$
31

 
$
(67
)
 
$
(89
)
 
$
103

 
$
51

 
$
(99
)
 
$
(47
)
Gain (Loss) Recognized in Income on Derivatives
The effect of derivatives not designated as hedging instruments on DTE Energy's Consolidated Statements of Operations is as follows:
 
 
Location of Gain (Loss) Recognized in Income on Derivatives
 
Gain (Loss) Recognized in Income on Derivatives for Years Ended December 31,
 
 
 
2018
 
2017
 
2016
 
 
 
 
(In millions)
Derivatives not Designated as Hedging Instruments
 
 
 
 
 
 
 
 
Commodity contracts
 
 
 
 
 
 
 
 
Natural gas
 
Operating Revenues — Non-utility operations
 
$
(42
)
 
$
(74
)
 
$
(153
)
Natural gas
 
Fuel, purchased power, and gas — non-utility
 
(94
)
 
97

 
(2
)
Electricity
 
Operating Revenues — Non-utility operations
 
49

 
105

 
43

Other
 
Operating Revenues — Non-utility operations
 
(1
)
 
2

 
5

Foreign currency exchange contracts
 
Operating Revenues — Non-utility operations
 
7

 
(2
)
 
(2
)
Total
 
 
 
$
(81
)
 
$
128

 
$
(109
)
Volume of Commodity Contracts
The following represents the cumulative gross volume of DTE Energy's derivative contracts outstanding as of December 31, 2018:
Commodity
 
Number of Units
Natural Gas (MMBtu)
 
2,171,541,994

Electricity (MWh)
 
36,163,761

Foreign Currency Exchange (Canadian dollars)
 
101,975,644