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Goodwill and Other Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of Goodwill
The following table summarizes the changes in the carrying amount of goodwill, by reportable segment for the years ended December 31, 2015 and 2014 in millions.
 
US
 
Andes
 
MCAC
 
Europe
 
Asia
 
Total
Balance as of December 31, 2013
 
 
 
 
 
 
 
 
 
 
 
Goodwill
$
2,658

 
$
899

 
$
149

 
$
180

 
$
68

 
$
3,954

Accumulated impairment losses
(2,152
)
 
—

 
—

 
(180
)
 
—

 
(2,332
)
Net balance
506

 
899

 
149

 
—

 
68

 
1,622

Impairment losses
(164
)
 
—

 
—

 
—

 
—

 
(164
)
Balance as of December 31, 2014
 
 
 
 
 
 
 
 
 
 
 
Goodwill
2,658

 
899

 
149

 
122

(1) 
68

 
3,896

Accumulated impairment losses
(2,316
)
 
—

 
—

 
(122
)
 
—

 
(2,438
)
Net balance
342

 
899

 
149

 
—

 
68

 
1,458

Impairment losses
(317
)
 
—

 
—

 
—

 
—

 
(317
)
Goodwill acquired during the year
16

 
—

 
—

 
—

 
—

 
16

Balance as of December 31, 2015
 
 
 
 
 
 
 
 
 
 
 
Goodwill
2,674

 
899

 
149

 
122

 
68

 
3,912

Accumulated impairment losses
(2,633
)
 
—

 
—

 
(122
)
 
—

 
(2,755
)
Net balance
$
41

 
$
899

 
$
149

 
$
—

 
$
68

 
$
1,157


_____________________________
(1) Both the gross carrying amount and the accumulated impairment losses of the Europe segment have been reduced by $58 million with no impact on the net carrying amount for the segment. This relates to Ebute, which had fully impaired goodwill of $58 million and was sold in 2014.
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, 2015
 
December 31, 2014
 
Gross Balance
 
Accumulated Amortization
 
Net Balance
 
Gross Balance
 
Accumulated Amortization
 
Net Balance
Subject to Amortization
 
 
 
 
 
 
 
 
 
 
 
Project development rights(1)
$
4

 
$
(1
)
 
$
3

 
$
28

 
$
(1
)
 
$
27

Sales concessions
71

 
(19
)
 
52

 
86

 
(41
)
 
45

Contractual payment rights(2)
66

 
(46
)
 
20

 
69

 
(40
)
 
29

Management rights
24

 
(10
)
 
14

 
33

 
(13
)
 
20

Land use rights
28

 
—

 
28

 
25

 
—

 
25

Contracts
29

 
(12
)
 
17

 
36

 
(19
)
 
17

Customer contracts and relationships (3)
6

 
(6
)
 
—

 
63

 
(39
)
 
24

Other(4)
15

 
(3
)
 
12

 
22

 
(5
)
 
17

Subtotal
243

 
(97
)
 
146

 
362

 
(158
)
 
204

Indefinite-Lived Intangible Assets
 
 
 
 
 
 
 
 
 
 
 
Land use rights
38

 
—

 
38

 
37

 
—

 
37

Water rights
17

 
—

 
17

 
20

 
—

 
20

Other
13

 
—

 
13

 
20

 
—

 
20

Subtotal
68

 
—

 
68

 
77

 
—

 
77

Total
$
311

 
$
(97
)
 
$
214

 
$
439

 
$
(158
)
 
$
281

_____________________________
(1) 
2014 balance includes U.K. Wind operations. In August 2014 these assets were sold, but did not meet the criteria to be reported as discontinued operations and their results are reflected within continuing operations. See Note 24—Dispositions and Held-for-Sale Businesses for further information.
(2) 
Represent legal rights to receive system reliability payments from the regulator.
(3) 
2014 balance includes DPLER which is considered held-for-sale as of December 31, 2015. See Note 24—Dispositions and Held-for-Sale Businesses for further information.
(4) 
Includes renewable energy certificates, emission allowances and various other intangible assets none of which is individually significant.
Schedule of Acquired Intangible Assets By Major Class
The following tables summarize, by category, other intangible assets acquired during the period indicated ($ in millions):
 
December 31, 2015
 
Amount
 
Subject to Amortization/Indefinite-Lived
 
Weighted Average Amortization Period (in years)
 
Amortization Method
Contracts
$
22

 
Subject to Amortization
 
5
 
Straight-line
Land-use rights
13

 
Subject to Amortization
 
N/A
 
N/A
Other
5

 
Various
 
N/A
 
N/A
Total
$
40

 
 
 
 
 
 
 
December 31, 2014
 
Amount
 
Subject to Amortization/
Indefinite-Lived
 
Weighted Average
Amortization Period (in years)
 
Amortization
Method
Renewable energy certificates
$
3

 
Indefinite
 
N/A
 
N/A
Land-use rights
16

 
Subject to Amortization
 
N/A
 
N/A
Total
$
19

 
 
 
 
 
 
Schedule of Expected Amortization Expense
The following table summarizes the estimated amortization expense by intangible asset category for 2016 through 2020:
(in millions)
2016
 
2017
 
2018
 
2019
 
2020
Sales concessions
7

 
7

 
7

 
7

 
7

All other
4

 
4

 
4

 
3

 
3

Total
$
11

 
$
11

 
$
11

 
$
10

 
$
10