Intangible Assets (Tables)

12 Months Ended

Mar. 31, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Summary of Amortizable Intangible Assets

The Company's estimated useful lives for finite-lived intangibles are shown in the table below:

Software	2 to 10 years
Customer related intangibles	Expected customer service life
Acquired contract related intangibles	Contract life and first contract renewal, where applicable

Intangible assets consisted of the following:

	As of March 31, 2019
(in millions)	Gross Carrying Value		Accumulated Amortization		Net Carrying Value
Software	$	3,864	$	2,235	$	1,629
Customer related intangible assets	5,389		1,139		4,250
Other intangible assets	85		25		60
Total intangible assets	$	9,338	$	3,399	$	5,939

	As of March 31, 2018
(in millions)	Gross Carrying Value		Accumulated Amortization		Net Carrying Value
Software	$	3,484	$	1,918	$	1,566
Customer related intangible assets	5,405		666		4,739
Other intangible assets	90		19		71
Total intangible assets	$	8,979	$	2,603	$	6,376

Schedule of Components of Amortization Expense

The components of amortization expense were as follows:

	Fiscal Years Ended
(in millions)	March 31, 2019		March 31, 2018		March 31, 2017
Intangible asset amortization	$	890	$	860	$	230
Transition and transformation contract cost amortization	258		226		79
Total amortization expense	$	1,148	$	1,086	$	309

Estimated Future Amortization of Intangible Assets

Estimated future amortization as of March 31, 2019 is as follows:

Fiscal Year	(in millions)
2020	$	954
2021	$	919
2022	$	780
2023	$	696
2024	$	639