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Intangible Assets ,net | 6 Months Ended
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Jun. 30, 2017
Goodwill and Intangible Assets |
Intangible Assets, net | 10. Intangible Assets, Net
|  | June 30, |  | December 31,
($ in millions) |  | 2017 |  | 2016
Acquired Rexam intangibles (net of accumulated amortization of $160 million at June 30, 2017, and $62 million at December 31, 2016) |  | $ | 2,340 |  | $ | 1,766
Capitalized software (net of accumulated amortization of $112 million at June 30, 2017, and $87 million at December 31, 2016) |  |  | 86 |  |  | 79
Other intangibles (net of accumulated amortization of $155 million at June 30, 2017, and $143 million at December 31, 2016) |  |  | 86 |  |  | 89
|  | $ | 2,512 |  | $ | 1,934
Total amortization expense of intangible assets amounted to $76 million and $117 million for the three and six months ended June 30, 2017, respectively, and $10 million and $20 million for the comparable periods in 2016, respectively. During the three months ended June 30, 2017, cumulative catch-up amortization recorded as a result of the change in the value of intangible assets associated with the finalization of the valuation for the Rexam acquisition was $23 million, of which $8 million related to the three months ended March 31, 2017, and $15 million related to the six months ended December 31, 2016.

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275 + Details
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