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Intangible Assets (Tables)

3 Months Ended

Mar. 31, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of intangible assets by class

Identifiable intangible assets consisted of the following:



(In millions)	Gross Carrying Amount				Accumulated Amortization				Net Book Value
March 31, 2020	Gross Carrying Amount				Accumulated Amortization				Net Book Value
Customer relationships	$	15,788			$	2,461			$	13,327
Acquired software and technology	2,534				651				1,883
Trade names	609				118				491
Capitalized software development costs	995				323				672
Purchased software	820				189				631
Total	$	20,746			$	3,742			$	17,004



(In millions)	Gross Carrying Amount				Accumulated Amortization				Net Book Value
December 31, 2019	Gross Carrying Amount				Accumulated Amortization				Net Book Value
Customer relationships	$	16,187			$	2,145			$	14,042
Acquired software and technology	2,607				639				1,968
Trade names	620				105				515
Capitalized software development costs	942				332				610
Purchased software	680				173				507
Total	$	21,036			$	3,394			$	17,642

Schedule of amortization expense of intangible assets

Amortization expense associated with the above identifiable intangible assets was as follows:



		Three Months Ended March 31,
(In millions)		2020				2019
Amortization expense		$	647			$	95