Changes in Accumulated Other Comprehensive Income by Component (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax	$ 15	$ (50)	$ (50)	$ (30)
Other comprehensive income (loss) before reclassifications	63	(25)	44
Amounts reclassified from accumulated other comprehensive income (loss)	2	25	(64)
Net current-period other comprehensive income (loss)	65	0	(20)
Unrealized Gains (Losses) on Available-for-Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(3)	0	(4)	(1)
Other comprehensive income (loss) before reclassifications	(3)	5	(1)
Amounts reclassified from accumulated other comprehensive income (loss)	0	(1)	(2)
Net current-period other comprehensive income (loss)	(3)	4	(3)
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	47	(29)	39	22
Other comprehensive income (loss) before reclassifications	74	(94)	79
Amounts reclassified from accumulated other comprehensive income (loss)	2	26	(62)
Net current-period other comprehensive income (loss)	76	(68)	17
Foreign Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax	(29)	(21)	(85)	$ (51)
Other comprehensive income (loss) before reclassifications	(8)	64	(34)
Amounts reclassified from accumulated other comprehensive income (loss)	0	0	0
Net current-period other comprehensive income (loss)	$ (8)	$ 64	$ (34)