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Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2019
Accounting Policies [Abstract]  
Schedule of Other Income
The following is a summary of DTE Energy's Other income:
 
2019
 
2018
 
2017
 
(In millions)
Income from REF entities
$
130

 
$
98

 
$
77

Equity earnings of equity method investees
111

 
132

 
102

Gains from equity securities
37

 
6

 
26

Contract services
29

 
51

 
19

Allowance for equity funds used during construction
24

 
28

 
23

Other
19

 
18

 
21

 
$
350

 
$
333

 
$
268

The following is a summary of DTE Electric's Other income:
 
2019
 
2018
 
2017
 
(In millions)
Gains from equity securities allocated from DTE Energy
$
37

 
$
6

 
$
26

Contract services
32

 
51

 
21

Allowance for equity funds used during construction
22

 
19

 
18

Other
16

 
7

 
12

 
$
107

 
$
83

 
$
77
Schedule of Accumulated Other Comprehensive Income (Loss)
The following table summarizes the changes in DTE Energy's Accumulated other comprehensive income (loss) by component(a) for the years ended December 31, 2019 and 2018:
 
Net Unrealized Gain (Loss) on Derivatives
 
Net Unrealized Loss on Investments
 
Benefit Obligations(b)
 
Foreign Currency Translation
 
Total
 
(In millions)
Balance, December 31, 2017
$
(3
)
 
$
(2
)
 
$
(110
)
 
$
(5
)
 
$
(120
)
Other comprehensive loss before reclassifications
(2
)
 
—

 
(1
)
 
(2
)
 
(5
)
Amounts reclassified from Accumulated other comprehensive income (loss)
1

 
—

 
9

 
—

 
10

Net current-period Other comprehensive income (loss)
(1
)
 
—


8


(2
)

5

Implementation of ASU 2016-01
(7
)
 
2

 
—

 
—

 
(5
)
Balance, December 31, 2018
$
(11
)
 
$
—


$
(102
)

$
(7
)

$
(120
)
Other comprehensive income (loss) before reclassifications
(14
)
 
—

 
(7
)
 
1

 
(20
)
Amounts reclassified from Accumulated other comprehensive income (loss)
2

 
—

 
15

 
—

 
17

Net current-period Other comprehensive income (loss)
(12
)
 
—


8


1


(3
)
Implementation of ASU 2018-02
(2
)
 
—

 
(23
)
 
—

 
(25
)
Balance, December 31, 2019
$
(25
)
 
$
—


$
(117
)

$
(6
)

$
(148
)
______________________________________
(a)
All amounts are net of tax, except for Foreign currency translation.
(b)
The amounts reclassified from Accumulated other comprehensive income (loss) are included in the computation of the net periodic pension and other postretirement benefit costs (see Note 21 to the Consolidated Financial Statements, "Retirement Benefits and Trusteed Assets").
Schedule of Finite-Lived Intangible Assets by Major Class
The Registrants have certain Intangible assets as shown below:
 
 
 
December 31, 2019
 
December 31, 2018
 
Useful Lives
 
Gross Carrying Value
 
Accumulated Amortization
 
Net Carrying Value
 
Gross Carrying Value
 
Accumulated Amortization
 
Net Carrying Value
 
 
 
(In millions)
Intangible assets subject to amortization
 
 
 
 
 
 
 
 
 
 
 
 
Customer relationships
25 to 40 years(a)
 
$
2,252

 
$
(66
)
 
$
2,186

 
$
779

 
$
(44
)
 
$
735

Contract intangibles
6 to 26 years
 
268

 
(76
)
 
192

 
159

 
(66
)
 
93

 
 
 
2,520

 
(142
)
 
2,378

 
938

 
(110
)
 
828

 
 
 
 
 
 
 
 
 
 
 
 
 
 
DTE Electric renewable energy credits
(b)
 
15

 
—

 
15

 
20

 
—

 
20

DTE Electric emission allowances
(b)
 
—

 
—

 
—

 
1

 
—

 
1

DTE Electric Long-term intangible assets
 
15

 
—

 
15

 
21

 
—

 
21

 
 
 
 
 
 
 
 
 
 
 
 
 
 
DTE Energy Long-term intangible assets
 
$
2,535

 
$
(142
)
 
$
2,393

 
$
959

 
$
(110
)
 
$
849


______________________________________
(a)
The useful lives of the customer relationship intangible assets are based on the number of years in which the assets are expected to economically contribute to the business. The expected economic benefit incorporates existing customer contracts and expected renewal rates based on the estimated volume and production lives of gas resources in the region.
(b)
Emission allowances and renewable energy credits are charged to expense, using average cost, as the allowances and credits are consumed in the operation of the business.
Schedule of Indefinite-Lived Intangible Assets
The Registrants have certain Intangible assets as shown below:
 
 
 
December 31, 2019
 
December 31, 2018
 
Useful Lives
 
Gross Carrying Value
 
Accumulated Amortization
 
Net Carrying Value
 
Gross Carrying Value
 
Accumulated Amortization
 
Net Carrying Value
 
 
 
(In millions)
Intangible assets subject to amortization
 
 
 
 
 
 
 
 
 
 
 
 
Customer relationships
25 to 40 years(a)
 
$
2,252

 
$
(66
)
 
$
2,186

 
$
779

 
$
(44
)
 
$
735

Contract intangibles
6 to 26 years
 
268

 
(76
)
 
192

 
159

 
(66
)
 
93

 
 
 
2,520

 
(142
)
 
2,378

 
938

 
(110
)
 
828

 
 
 
 
 
 
 
 
 
 
 
 
 
 
DTE Electric renewable energy credits
(b)
 
15

 
—

 
15

 
20

 
—

 
20

DTE Electric emission allowances
(b)
 
—

 
—

 
—

 
1

 
—

 
1

DTE Electric Long-term intangible assets
 
15

 
—

 
15

 
21

 
—

 
21

 
 
 
 
 
 
 
 
 
 
 
 
 
 
DTE Energy Long-term intangible assets
 
$
2,535

 
$
(142
)
 
$
2,393

 
$
959

 
$
(110
)
 
$
849


______________________________________
(a)
The useful lives of the customer relationship intangible assets are based on the number of years in which the assets are expected to economically contribute to the business. The expected economic benefit incorporates existing customer contracts and expected renewal rates based on the estimated volume and production lives of gas resources in the region.
(b)
Emission allowances and renewable energy credits are charged to expense, using average cost, as the allowances and credits are consumed in the operation of the business.
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense
The following table summarizes DTE Energy's estimated customer relationship and contract intangible amortization expense expected to be recognized during each year through 2024:
 
2020
 
2021
 
2022
 
2023
 
2024
 
(In millions)
Estimated amortization expense
$
82

 
$
86

 
$
86

 
$
86

 
$
86
Schedule of Accounting Policies
See the following notes for other accounting policies impacting the Registrants’ Consolidated Financial Statements:
Note
 
Title
5
 
Revenue
9
 
Asset Retirement Obligations
10
 
Regulatory Matters
11
 
Income Taxes
13
 
Fair Value
14
 
Financial and Other Derivative Instruments
18
 
Leases
21
 
Retirement Benefits and Trusteed Assets
22
 
Stock-Based Compensation