Changes in Accumulated Other Comprehensive Income by Component (Details) - USD ($) $ in Millions		12 Months Ended
	Apr. 01, 2018	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax		$ (50)	$ (50)	$ (30)	$ (127)
Other comprehensive income (loss) before reclassifications		(25)	44	81
Amounts reclassified from accumulated other comprehensive income (loss)		25	(64)	(7)
Net current-period other comprehensive income (loss)		0	(20)	74
Unrealized Gains (Losses) on Available-for-Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax		0	(4)	(1)	(8)
Other comprehensive income (loss) before reclassifications		5	(1)	6
Amounts reclassified from accumulated other comprehensive income (loss)		(1)	(2)	1
Net current-period other comprehensive income (loss)		4	(3)	7
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax		(29)	39	22	(89)
Other comprehensive income (loss) before reclassifications		(94)	79	96
Amounts reclassified from accumulated other comprehensive income (loss)		26	(62)	(8)
Net current-period other comprehensive income (loss)		(68)	17	88
Foreign Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax		(21)	(85)	(51)	$ (30)
Other comprehensive income (loss) before reclassifications		64	(34)	(21)
Amounts reclassified from accumulated other comprehensive income (loss)		0	0	0
Net current-period other comprehensive income (loss)		$ 64	$ (34)	$ (21)
Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Other comprehensive income (loss) before reclassifications	$ 22
ASU 2018-02 [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Amounts reclassified from accumulated other comprehensive income (loss)	1
Adjustments for adopted accounting pronouncements on April 1, 2018 [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(104)
Adjustments for adopted accounting pronouncements on April 1, 2018 [Member] | Unrealized Gains (Losses) on Available-for-Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(8)
Adjustments for adopted accounting pronouncements on April 1, 2018 [Member] | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(66)
Adjustments for adopted accounting pronouncements on April 1, 2018 [Member] | Foreign Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ (30)