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Goodwill and Other Intangibles (Tables)
 12 Months Ended
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Summary of the Components of Intangible Assets Subject to Amortization
The following tables summarize the components of NRG's intangible assets subject to amortization:
 
 
 
Contracts
 
 
 
 
 
 
 
 
 
 
Year Ended December 31, 2018
Emission
Allowances
 
Fuel
 
Customer Contracts
 
Customer
Relationships
 
Marketing Partnerships
 
Trade
Names
 
Other
 
Total
 
 
January 1, 2018
$
755

 
$
49

 
$
1

 
$
768

 
$
88

 
$
342

 
$
77

 
$
2,080

Purchases
33

 
—

 
—

 
—

 
—

 
—

 
28

 
61

Acquisition of businesses(a)
—

 
—

 
—

 
122

 
43

 
13

 
—

 
178

Usage
(1
)
 
—

 
—

 
—

 
—

 
—

 
(26
)
 
(27
)
Write-off of fully amortized balances
(107
)
 
—

 
—

 
(411
)
 
—

 
(10
)
 
—

 
(528
)
Impairment
(5
)
 
—

 
—

 
(1
)
 
—

 
—

 
—

 
(6
)
Other
(16
)
 
—

 
—

 
—

 
—

 
—

 
—

 
(16
)
December 31, 2018
659

 
49

 
1

 
478

 
131

 
345

 
79

 
1,742

Less accumulated amortization
(515
)
 
(45
)
 
(1
)
 
(314
)
 
(61
)
 
(195
)
 
(20
)
 
(1,151
)
Net carrying amount
$
144

 
$
4

 
$
—

 
$
164

 
$
70

 
$
150

 
$
59

 
$
591


(a) T
Schedule of Amortization of Intangible Expense
The following table presents NRG's amortization of intangible assets for each of the past three years:
 
Years Ended December 31,
Amortization
2018
 
2017
 
2016
 
(In millions)
Emission allowances
$
39

 
$
71

 
$
62

Energy supply contracts
—

 
1

 
6

Fuel contracts
—

 
1

 
1

Customer relationships
32

 
34

 
48

Marketing partnerships
9

 
5

 
8

Trade names
23

 
23

 
23

Other
4

 
3

 
9

Total amortization
$
107

 
$
138

 
$
157
Schedule of Estimated Amortization of Intangible Assets for Next Five Years
The following table presents estimated amortization of NRG's intangible assets for each of the next five years:
Year Ended December 31,
Emission
Allowances
 
Fuel Contracts
 
Customer
Relationships
 
Marketing Partnerships
 
Trade
Names
 
Other
 
Total
 
(In millions)
2019
$
48

 
$
—

 
$
38

 
$
11

 
$
24

 
$
3

 
$
124

2020
37

 
1

 
39

 
11

 
25

 
3

 
116

2021
43

 
—

 
33

 
10

 
24

 
3

 
113

2022
50

 
—

 
23

 
10

 
24

 
3

 
110

2023
49

 
1

 
26

 
10

 
24

 
3

 
113
Schedule of Out of Market Contracts, Future Amortization
The following table summarizes the estimated amortization related to NRG's out-of-market contracts:
Year Ended December 31,
Leases
 
 
2019
$
8

2020
8

2021
8

2022
8

2023
8