Goodwill and Intangible Assets, Net

6 Months Ended

Sep. 30, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Changes in the carrying amount of goodwill were as follows:



(In millions)	U.S. Pharmaceutical and Specialty Solutions			European Pharmaceutical Solutions			Medical-Surgical Solutions		Other		Total
Balance, March 31, 2019	$	4,078		$	—		$	2,451	$	2,829	$	9,358
Goodwill acquired	—			54			—		—		54
Acquisition accounting, transfers and other adjustments	—			4			7		—		11
Foreign currency translation adjustments, net	(18		)	(1		)	—		4		(15		)
Balance, September 30, 2019	$	4,060		$	57		$	2,458	$	2,833	$	9,408

Information regarding intangible assets is as follows:



	September 30, 2019								March 31, 2019
(Dollars in millions)	Weighted Average Remaining Amortization Period (Years)	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Customer relationships	11	$	3,787	$	(1,913	)	$	1,874	$	3,818	$	(1,801	)	$	2,017
Service agreements	11	1,019		(461		)	558		1,017		(430		)	587
Pharmacy licenses	25	530		(208		)	322		513		(209		)	304
Trademarks and trade names	13	852		(251		)	601		887		(232		)	655
Technology	4	178		(108		)	70		141		(94		)	47
Other	5	275		(211		)	64		288		(209		)	79
Total		$	6,641	$	(3,152	)	$	3,489	$	6,664	$	(2,975	)	$	3,689

Amortization expense of intangible assets was $118 million and $230 million for the second quarter and first six months of 2020 and $121 million and $243 million for the second quarter and first six months of 2019. Estimated amortization expense of these assets is as follows: $232 million, $438 million, $358 million, $261 million and $245 million for the remainder of 2020 and each of the succeeding years through 2024 and $1,955 million thereafter. All intangible assets were subject to amortization as of September 30, 2019 and March 31, 2019.