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Goodwill and Other Intangible Assets (Tables)
12 Months Ended
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill The following table summarizes the carrying amount of goodwill by reportable segment for the years ended December 31, 2018 and 2017 (in millions):
 
US and Utilities
 
South America
 
MCAC
 
Eurasia
 
Total
Balance as of December 31, 2017
 
 
 
 
 
 
 
 
 
Goodwill
$
2,786

 
$
868

 
$
16

 
$
122

 
$
3,792

Accumulated impairment losses
(2,611
)
 

 

 
(122
)
 
(2,733
)
Net balance
175

 
868

 
16

 

 
1,059

Balance as of December 31, 2018
 
 
 
 
 
 
 
 
 
Goodwill
2,786

 
868

 
16

 
122

 
3,792

Accumulated impairment losses
(2,611
)
 

 

 
(122
)
 
(2,733
)
Net balance
$
175

 
$
868

 
$
16

 
$

 
$
1,059

Schedule of Finite-Lived and Indefinite-Lived Intangible Assets The following table summarizes the balances comprising Other intangible assets in the accompanying Consolidated Balance Sheets (in millions) as of the periods indicated:
 
December 31, 2018
 
December 31, 2017
 
Gross Balance
 
Accumulated Amortization
 
Net Balance
 
Gross Balance
 
Accumulated Amortization
 
Net Balance
Subject to Amortization
 
 
 
 


 
 
 
 
 
 
Internal-use software
$
467

 
$
(344
)
 
$
123

 
$
416

 
$
(330
)
 
$
86

Contracts
137

 
(24
)
 
113

 
92

 
(21
)
 
71

Project development rights
93

 
(1
)
 
92

 
57

 
(1
)
 
56

Contractual payment rights (1)
57

 
(44
)
 
13

 
65

 
(47
)
 
18

Emissions allowances (2)
15

 

 
15

 

 

 

Other (3)
78

 
(44
)
 
34

 
98

 
(42
)
 
56

Subtotal
847

 
(457
)
 
390

 
728

 
(441
)
 
287

Indefinite-Lived Intangible Assets
 
 
 
 
 
 
 
 
 
 
 
Land use rights
21

 

 
21

 
45

 

 
45

Water rights
20

 

 
20

 
20

 

 
20

Other
5

 

 
5

 
14

 

 
14

Subtotal
46

 

 
46

 
79

 

 
79

Total
$
893

 
$
(457
)
 
$
436

 
$
807

 
$
(441
)
 
$
366

_____________________________
(1) 
Represent legal rights to receive system reliability payments from the regulator.
(2) 
Acquired or purchased emissions allowances are finite-lived intangible assets that are expensed when utilized and included in net income for the year.
(3) 
Includes management rights, sales concessions, renewable energy credits and incentives, and other individually insignificant intangible assets. During the fourth quarter of 2018, the Company recognized an asset impairment of $23 million on gas extraction rights at Nejapa. See Note 20Asset Impairment Expense for further information.
Schedule of Acquired Intangible Assets By Major Class The following tables summarize other intangible assets acquired during the periods indicated (in millions):
December 31, 2018
Amount
 
Subject to Amortization/Indefinite-Lived
 
Weighted Average Amortization Period (in years)
 
Amortization Method
Internal-use software
$
67

 
Subject to Amortization
 
6
 
Straight-line
Contracts
50

 
Subject to Amortization
 
24
 
Straight-line
Project development rights
35

 
Subject to Amortization
 
23
 
Straight-line
Emissions allowances
16

 
Subject to Amortization
 
Various
 
As utilized
Other
11

 
Various
 
N/A
 
N/A
Total
$
179

 
 
 
 
 
 
December 31, 2017
Amount
 
Subject to Amortization/Indefinite-Lived
 
Weighted Average Amortization Period (in years)
 
Amortization
Method
Project Development Rights
$
53

 
Subject to Amortization
 
30
 
Straight-line
Contracts
34

 
Subject to Amortization
 
25
 
Straight-line
Internal-use software
17

 
Subject to Amortization
 
7
 
Straight-line
Other
8

 
Various
 
N/A
 
N/A
Total
$
112

 
 
 
 
 
 
Schedule of Expected Amortization Expense The following table summarizes the estimated amortization expense by intangible asset category for 2019 through 2023:
(in millions)
2019
 
2020
 
2021
 
2022
 
2023
Internal-use software
$
33

 
$
28

 
$
19

 
$
13

 
$
7

Contracts
4

 
4

 
4

 
4

 
4

Other
8

 
8

 
6

 
6

 
6

Total
$
45

 
$
40

 
$
29

 
$
23

 
$
17