Asset acquisition, contingent consideration, liability

  
Amortization expense for identifiable definite-lived intangible assets for the years ended December 31, 2021, 2020 and 2019 was $222 million, $192 million and $190 million, respectively. The annual estimated amortization expense related to these intangible assets for each of the five succeeding calendar years is $214 million, $216 million, $219 million, $224 million and $146 million for 2022, 2023, 2024, 2025 and 2026, respectively.  
During the second quarter of 2021, the Company purchased certain developed technology rights for an initial payment of $3 million. The purchase consideration also includes contingent payments of $17 million to be made upon reaching certain regulatory and commercial milestones, which were not yet deemed probable at December 31, 2021.  
  
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