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During the second quarter of 2019, the Company recorded a charge of $197 for intangible asset impairments associated with the Disks long-lived asset group. See Note M  for additional details. 

Computer software consists primarily of software costs associated with an enterprise business solution within Arconic to drive common systems among all businesses. 

Amortization expense related to the intangible assets in the tables above for the years ended December 31, 2019, 2018, and 2017 was $70, $81, and $71, respectively, and is expected to be in the range of approximately $50 to $60 annually from 2020 to 2024. 

## O. Leases 

Operating lease cost, which includes short-term leases and variable lease payments and approximates cash paid, was $145, $144, and $113 in 2019, 2018, and 2017, respectively. 

Operating lease right-of-use assets and lease liabilities in the Consolidated Balance Sheet were as follows: 

<img src='content_image/1041220.jpg'>

Future minimum contractual operating lease obligations were as follows: 

<img src='content_image/1041221.jpg'>

Right-of-use assets obtained in exchange for operating lease obligations in 2019 were $41. The weighted-average remaining lease term and weighted-average discount rate at December 31, 2019 was 6 years and 6.0%, respectively. 

