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Goodwill and Other Intangible Assets
 9 Months Ended
Sep. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Other Intangible Assets Goodwill and Other Intangible Assets
The following table shows the carrying amount of goodwill by reportable segment as of September 30, 2019 and December 31, 2018:
 
Ammonia
 
Granular Urea
 
UAN
 
AN
 
Other
 
Total
 
(in millions)
Balance as of December 31, 2018
$
586

 
$
828

 
$
576

 
$
292

 
$
71

 
$
2,353

Effect of exchange rate changes
(1
)
 
—

 
—

 
(7
)
 
(1
)
 
(9
)
Balance as of September 30, 2019
$
585

 
$
828

 
$
576

 
$
285

 
$
70

 
$
2,344


All of our identifiable intangible assets have definite lives and are presented in other assets on our consolidated balance sheets at gross carrying amount, net of accumulated amortization, as follows:
 
September 30, 2019
 
December 31, 2018
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net
 
(in millions)
Customer relationships
$
125

 
$
(42
)
 
$
83

 
$
127

 
$
(37
)
 
$
90

TerraCair brand
—

 
—

 
—

 
10

 
(10
)
 
—

Trade names
29

 
(6
)
 
23

 
30

 
(5
)
 
25

Total intangible assets
$
154

 
$
(48
)
 
$
106

 
$
167

 
$
(52
)
 
$
115


Our intangible assets are being amortized over a weighted-average life of approximately 20 years. Amortization expense of our identifiable intangible assets was $2 million and $6 million for the three and nine months ended September 30, 2019, respectively, and $1 million and $6 million for the three and nine months ended September 30, 2018, respectively. The gross carrying amount and accumulated amortization of our intangible assets are also impacted by the effect of exchange rate changes. Total estimated amortization expense for the remainder of 2019 and each of the five succeeding fiscal years is as follows:
 
Estimated
Amortization
Expense
 
(in millions)
Remainder of 2019
$
2

2020
8

2021
8

2022
8

2023
8

2024
8