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Goodwill and Intangible Assets
12 Months Ended
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Core Deposit Intangibles
GOODWILL AND CORE DEPOSIT INTANGIBLES
The following table summarizes the carrying value of goodwill by reporting unit for the years ended December 31, 2017 and 2016.
(in millions)
 
 
 
December 31
2017
 
2016
Business Bank
$
380

 
$
380

Retail Bank
194

 
194

Wealth Management
61

 
61

Total
$
635

 
$
635

The Corporation performs its annual evaluation of goodwill impairment in the third quarter of each year and on an interim basis if events or changes in circumstances between annual tests indicate goodwill might be impaired. In 2017 and 2016, the annual test of goodwill impairment was performed as of the beginning of the third quarter. At the conclusion of the first step of the annual and interim goodwill impairment tests performed in 2017 and 2016 the estimated fair values of all reporting units exceeded their carrying amounts, including goodwill, indicating that goodwill was not impaired. There have been no events since the annual test performed in the third quarter 2017 that would indicate that it was more likely than not that goodwill had become impaired.
A summary of core deposit intangible carrying value and related accumulated amortization follows:
(in millions)
 
 
 
December 31
2017
 
2016
Gross carrying amount
$
34

 
$
34

Accumulated amortization
(28
)
 
(26
)
Net carrying amount
$
6

 
$
8

The Corporation recorded amortization expense related to the core deposit intangible of $2 million for each of the years ended December 31, 2017 and 2016, and $3 million for 2015. At December 31, 2017, estimated future amortization expense was as follows:
(in millions)
 
Years Ending December 31
 
2018
$
2

2019
2

2020
1

2021
1

Total
$
6