Amortization of other intangible assets was $220 million in 2020, $210 million in 2019 and $204 million in 2018. Estimated intangible assets amortization expense for each of the five succeeding fiscal years is as follows:



	Amortization expense
	(in millions)
2021	$	166
2022	88
2023	65
2024	26
2025	9
Thereafter	5

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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