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Revenue
 6 Months Ended
Jun. 30, 2019
Revenue from Contract with Customer [Abstract]  
Revenue REVENUE
Disaggregation of Revenue
The following is a summary of revenues disaggregated by segment for DTE Energy:
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2019
 
2018
 
2019
 
2018
 
(In millions)
Electric(a)
 
 
 
 
 
 
 
Residential
$
494

 
$
584

 
$
1,047

 
$
1,170

Commercial
423

 
446

 
843

 
875

Industrial
158

 
178

 
322

 
354

Other(b)
115

 
68

 
213

 
82

Total Electric operating revenues(c)
$
1,190

 
$
1,276

 
$
2,425

 
$
2,481

 
 
 
 
 
 
 
 
Gas
 
 
 
 
 
 
 
Gas sales
$
163

 
$
180

 
$
640

 
$
637

End User Transportation
42

 
49

 
122

 
134

Intermediate Transportation
15

 
11

 
41

 
29

Other(b)
23

 
15

 
85

 
5

Total Gas operating revenues(d)
$
243

 
$
255

 
$
888

 
$
805

 
 
 
 
 
 
 
 
Other segment operating revenues
 
 
 
 
 
 
 
Gas Storage and Pipelines(e)
$
121

 
$
122

 
$
237

 
$
241

Power and Industrial Projects(f)
$
402

 
$
538

 
$
790

 
$
1,105

Energy Trading(g)
$
1,113

 
$
1,164

 
$
2,414

 
$
2,662

_______________________________________
(a)
Revenues under the Electric segment generally represent those of DTE Electric.
(b)
Includes revenue adjustments related to various regulatory mechanisms.
(c)
Includes $5 million and $4 million of other revenues outside the scope of Topic 606 for the three months ended June 30, 2019 and 2018, respectively, and $8 million and $9 million for the six months ended June 30, 2019 and 2018, respectively.
(d)
Includes $1 million and $4 million under Alternative Revenue Programs for the three and six months ended June 30, 2018, respectively, and $2 million of other revenues for the three months ended June 30, 2019 and 2018 and $4 million for the six months ended June 30, 2019 and 2018, which are both outside the scope of Topic 606.
(e)
Includes revenues outside the scope of Topic 606 primarily related to $2 million and $4 million of contracts accounted for as leases for the three and six months ended June 30, 2019, respectively.
(f)
Includes revenues outside the scope of Topic 606 primarily related to $30 million and $28 million of contracts accounted for as leases for the three months ended June 30, 2019 and 2018, respectively, and $61 million and $56 million for the six months ended June 30, 2019 and 2018, respectively.
(g)
Includes revenues outside the scope of Topic 606 primarily related to $879 million and $937 million of derivatives for the three months ended June 30, 2019 and 2018, respectively, and $1.8 billion and $2.1 billion of derivatives for the six months ended June 30, 2019 and 2018, respectively.
Deferred Revenue
The following is a summary of deferred revenue activity:
 
DTE Energy
 
(In millions)
Beginning Balance, January 1, 2019
$
74

Increases due to cash received or receivable, excluding amounts recognized as revenue during the period
35

Revenue recognized that was included in the deferred revenue balance at the beginning of the period
(26
)
Ending Balance, June 30, 2019
$
83


The deferred revenues at DTE Energy generally represent amounts paid by or receivable from customers for which the associated performance obligation has not yet been satisfied.
Deferred revenues include amounts associated with REC performance obligations under certain wholesale full requirements power contracts. Deferred revenues associated with RECs are recognized as revenue when control of the RECs has transferred.
Other performance obligations associated with deferred revenues include providing products and services related to customer prepayments. Deferred revenues associated with these products and services are recognized when control has transferred to the customer.
The following table represents deferred revenue amounts for DTE Energy that are expected to be recognized as revenue in future periods:
 
DTE Energy
 
(In millions)
2019
$
48

2020
5

2021
5

2022
7

2023
3

2024 and thereafter
15

 
$
83


Transaction Price Allocated to the Remaining Performance Obligations
In accordance with optional exemptions available under Topic 606, the Registrants did not disclose the value of unsatisfied performance obligations for (1) contracts with an original expected length of one year or less, (2) with the exception of fixed consideration, contracts for which revenue is recognized at the amount to which the Registrants have the right to invoice for goods provided and services performed, and (3) contracts for which variable consideration relates entirely to an unsatisfied performance obligation.
Such contracts consist of varying types of performance obligations across the segments, including the supply and delivery of energy related products and services. Contracts with variable volumes and/or variable pricing, including those with pricing provisions tied to a consumer price or other index, have also been excluded as the related consideration under the contract is variable at inception of the contract. Contract lengths vary from cancelable to multi-year.
The Registrants expect to recognize revenue for the following amounts related to fixed consideration associated with remaining performance obligations in each of the future periods noted:
 
DTE Energy
 
DTE Electric
 
(In millions)
2019
$
111

 
$
5

2020
305

 
—

2021
249

 
—

2022
191

 
—

2023
133

 
—

2024 and thereafter
645

 
—

 
$
1,634

 
$
5


Other Matters
The following table represents expenses recognized for estimated uncollectible accounts receivable:
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2019
 
2018
 
2019
 
2018
 
(In millions)
DTE Energy
$
24

 
$
31

 
$
53

 
$
56

DTE Electric
$
14

 
$
17

 
$
30

 
$
31