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INTANGIBLE ASSETS
 12 Months Ended
Dec. 31, 2019
Intangible Assets, Net (Excluding Goodwill) [Abstract]  
Intangible Assets INTANGIBLE ASSETS
The following table provides information regarding the Corporation's intangible assets:

Intangible Assets at Dec 31
2019
2018
In millions
Gross Carrying Amount
Accum Amort
Net
Gross Carrying Amount
Accum Amort
Net
Intangible assets with finite lives:
 
 
 
 
 
 
Licenses and developed technology
$
33

$
(33
)
$
—

$
33

$
(33
)
$
—

Software
79

(57
)
22

79

(54
)
25

Total intangible assets
$
112

$
(90
)
$
22

$
112

$
(87
)
$
25



The following table provides information regarding amortization expense:

Amortization Expense
 
 
 
In millions
2019
2018
2017
Software 1
$
7

$
6

$
5


1.
Included in “Cost of sales” in the consolidated statements of income.

Total estimated amortization expense for the next five fiscal years, including amounts for intangible assets not yet placed in service, is as follows:

Estimated Amortization Expense for Next Five Years
In millions
2020
$
8

2021
$
6

2022
$
5

2023
$
3

2024
$
1