Income Taxes - Components Of Deferred Tax Balances (Details) - USD ($) $ in Millions	Mar. 31, 2020	Mar. 31, 2019
Assets
Receivable allowances	$ 72	$ 70
Compensation and benefit related accruals	331	377
Net operating loss and credit carryforwards	828	885
Lease obligations	482
Other	109	216
Subtotal	1,822	1,548
Less: valuation allowance	(833)	(870)
Total assets	989	678
Liabilities
Inventory valuation and other assets	(1,947)	(2,016)
Fixed assets and systems development costs	(202)	(170)
Intangibles	(531)	(513)
Change Healthcare equity investment	0	(885)
Lease right-of-use assets	(449)
Other	(56)	(34)
Total liabilities	(3,185)	(3,618)
Net deferred tax liability	(2,196)	(2,940)
Long-term deferred tax asset	59	58
Long-term deferred tax liability	$ (2,255)	$ (2,998)