INTANGIBLE ASSETS

12 Months Ended

Dec. 31, 2020

Intangible Assets, Net (Excluding Goodwill) [Abstract]

Schedule of Intangible Assets and Goodwill

The following table provides information regarding the Corporation's intangible assets:

Intangible Assets at Dec 31	2020						2019
In millions	Gross Carrying Amount		Accum Amort		Net		Gross Carrying Amount		Accum Amort		Net
Intangible assets with finite lives:
Developed technology	$	33	$	(33)	$	—	$	33	$	(33)	$	—
Software	80		(64)		16		79		(57)		22
Total intangible assets	$	113	$	(97)	$	16	$	112	$	(90)	$	22

Schedule Of Finite Lived Intangible Assets Amortization Expense Table

The following table provides information regarding amortization expense:

Amortization Expense
In millions	2020		2019		2018
Software, included in "Cost of sales"	$	8	$	7	$	6

Schedule of Expected Amortization Expense

Total estimated amortization expense for the next five fiscal years, including amounts expected to be capitalized, is as follows:

Estimated Amortization Expense for Next Five Years
In millions
2021	$	6
2022	$	5
2023	$	2
2024	$	1
2025	$	—