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Revenue
 9 Months Ended
Sep. 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 September 30,
 
Nine Months Ended September 30,
 
2019
 
2018
 
2019
 
2018
 
(In millions)
Electric(a)
 
 
 
 
 
 
 
Residential
$
791

 
$
773

 
$
1,839

 
$
1,943

Commercial
515

 
495

 
1,358

 
1,370

Industrial
175

 
173

 
497

 
527

Other(b)
39

 
80

 
251

 
162

Total Electric operating revenues(c)
$
1,520

 
$
1,521

 
$
3,945

 
$
4,002

 
 
 
 
 
 
 
 
Gas
 
 
 
 
 
 
 
Gas sales
$
87

 
$
89

 
$
727

 
$
726

End User Transportation
35

 
34

 
157

 
168

Intermediate Transportation
15

 
9

 
57

 
38

Other(b)
18

 
32

 
102

 
37

Total Gas operating revenues(d)
$
155

 
$
164

 
$
1,043

 
$
969

 
 
 
 
 
 
 
 
Other segment operating revenues
 
 
 
 
 
 
 
Gas Storage and Pipelines(e)
$
126

 
$
122

 
$
363

 
$
363

Power and Industrial Projects(f)
$
406

 
$
612

 
$
1,196

 
$
1,717

Energy Trading(g)
$
1,105

 
$
1,332

 
$
3,519

 
$
3,994

_______________________________________
(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 $6 million of other revenues outside the scope of Topic 606 for the three months ended September 30, 2019 and 2018, respectively, and $14 million and $15 million for the nine months ended September 30, 2019 and 2018, respectively.
(d)
Includes $4 million under Alternative Revenue Programs for the nine months ended September 30, 2018. Also includes $2 million of other revenues for the three months ended September 30, 2019 and 2018 and $6 million for the nine months ended September 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 $7 million of contracts accounted for as leases for the three and nine months ended September 30, 2019, respectively.
(f)
Includes revenues outside the scope of Topic 606 primarily related to $33 million and $37 million of contracts accounted for as leases for the three months ended September 30, 2019 and 2018, respectively, and $94 million and $93 million for the nine months ended September 30, 2019 and 2018, respectively.
(g)
Includes revenues outside the scope of Topic 606 primarily related to $791 million and $1.1 billion of derivatives for the three months ended September 30, 2019 and 2018, respectively, and $2.6 billion and $3.2 billion of derivatives for the nine months ended September 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
41

Revenue recognized that was included in the deferred revenue balance at the beginning of the period
(50
)
Ending Balance, September 30, 2019
$
65


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
$
9

2020
25

2021
6

2022
7

2023
6

2024 and thereafter
12

 
$
65


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
$
52

 
$
3

2020
290

 
—

2021
269

 
—

2022
206

 
—

2023
142

 
—

2024 and thereafter
648

 
—

 
$
1,607

 
$
3


Other Matters
The following table represents expenses recognized for estimated uncollectible accounts receivable:
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2019
 
2018
 
2019
 
2018
 
(In millions)
DTE Energy
$
28

 
$
39

 
$
81

 
$
95

DTE Electric
$
17

 
$
26

 
$
47

 
$
57