Segment Information (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Revenue, Major Customer and Geographic Information [Line Items]
Disclosure on Geographic Areas, Revenue from External Customers Attributed to Foreign Countries	$ 5,629	$ 5,537	$ 4,950
Entity Wide Revenue By Major Customer Percent Of Revenue Did Not Exceed Ten Percent	10.00%
Sales Revenue, Net [Member] \| Customer Concentration Risk [Member] \| Sony [Member]
Revenue, Major Customer and Geographic Information [Line Items]
Entity Wide Revenue By Major Customer Percent Of Revenue	36.00%	32.00%	29.00%
Sales Revenue, Net [Member] \| Customer Concentration Risk [Member] \| Microsoft [Member]
Revenue, Major Customer and Geographic Information [Line Items]
Entity Wide Revenue By Major Customer Percent Of Revenue	18.00%	17.00%	16.00%
Switzerland [Member]
Revenue, Major Customer and Geographic Information [Line Items]
Disclosure on Geographic Areas, Revenue from External Customers Attributed to Foreign Countries	$ 2,731	$ 2,586	$ 2,303
Disclosure on Geographic Areas, Revenue from External Customers Attributed to Foreign Countries, Percentage	49.00%	47.00%	47.00%
United States [Member]
Revenue, Major Customer and Geographic Information [Line Items]
Disclosure on Geographic Areas, Revenue from External Customers Attributed to Entity's Country of Domicile	99.00%

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