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Intangible Assets, Net | 3 Months Ended
--- | ---
Mar. 31, 2020
Goodwill and Intangible Assets, Net |
Intangible Assets, Net | 12. Intangible Assets, Net ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, | ​ | December 31,
($ in millions) |  | 2020 |  | 2019
​ | ​ | ​ | ​ | ​ | ​ | ​
Acquired Rexam customer relationships and other Rexam intangibles (net of accumulated amortization of $591 million at March 31, 2020, and $567 million at December 31, 2019) | ​ | $ | 1,829 | ​ | $ | 1,909
Capitalized software (net of accumulated amortization of $175 million at March 31, 2020, and $170 million at December 31, 2019) | ​ | ​ | 64 | ​ | ​ | 69
Other intangibles (net of accumulated amortization of $115 million at March 31, 2020, and $116 million at December 31, 2019) | ​ | ​ | 21 | ​ | ​ | 24
​ | ​ | $ | 1,914 | ​ | $ | 2,002
​ Total amortization expense of intangible assets amounted to $45 million and $48 million for the three months ended March 31, 2020 and 2019, respectively.

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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