Income Taxes (Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Millions	Mar. 31, 2022	Mar. 31, 2021
Income Tax Disclosure [Line Items]
Accruals, reserves and other expenses	$ 185	$ 158
Tax credit carryforwards	198	161
Stock-based compensation	43	43
Net operating loss & capital loss carryforwards	349	258
Deferred Tax Asset, Intra-entity Transfer, Asset Other than Inventory	1,782	1,781
Total	2,557	2,401
Valuation allowance	(296)	(230)
Deferred tax assets, net of valuation allowance	2,261	2,171
Amortization and Depreciation	(13)	(140)
ASC 606 Revenue Recognition	0	(21)
Prepaids and other liabilities	(7)	(8)
Deferred Tax Liabilities, Net	(20)	(169)
Deferred tax assets, net of valuation allowance and deferred tax liabilities	$ 2,241	$ 2,002