Changes in Accumulated Other Comprehensive Income by Component (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2021		Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	$ (2)	$ (89)	$ (50)	[1]	$ (50)
Other comprehensive income (loss) before reclassifications	22	(25)	45		(58)
Amounts reclassified from accumulated other comprehensive income (loss)	(14)	20	11		14
Total other comprehensive income (loss), net of tax	8	(5)	56		(44)
Ending balance	6	(94)	6		(94)
Unrealized Gains (Losses) on Available-for-Sale Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	0	4	0		(4)
Other comprehensive income (loss) before reclassifications	(1)	(2)	(1)		6
Amounts reclassified from accumulated other comprehensive income (loss)	0	0	0		0
Total other comprehensive income (loss), net of tax	(1)	(2)	(1)		6
Ending balance	(1)	2	(1)		2
Unrealized Gains (Losses) on Derivative Instruments [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	27	(41)	(29)		39
Other comprehensive income (loss) before reclassifications	24	(46)	55		(120)
Amounts reclassified from accumulated other comprehensive income (loss)	(14)	20	11		14
Total other comprehensive income (loss), net of tax	10	(26)	66		(106)
Ending balance	37	(67)	37		(67)
Foreign Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(29)	(52)	(21)		(85)
Other comprehensive income (loss) before reclassifications	(1)	23	(9)		56
Amounts reclassified from accumulated other comprehensive income (loss)	0	0	0		0
Total other comprehensive income (loss), net of tax	(1)	23	(9)		56
Ending balance	$ (30)	$ (29)	$ (30)		$ (29)

[1] Derived from audited Consolidated Financial Statements.