Accumulated Other Comprehensive Income (Loss) - Schedule of Changes in AOCI (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023		Sep. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	$ (75)	$ 71	$ (67)	[1]	$ 15
Other comprehensive income (loss) before reclassifications	50	122	67		194
Amounts reclassified from accumulated other comprehensive income (loss)	(9)	(56)	(34)		(72)
Total other comprehensive income (loss), net of tax	41	66	33		122
Ending balance	(34)	137	(34)		137
Unrealized Net Gains (Losses) on Available-for-Sale Securities
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(1)	(4)	(1)		(3)
Other comprehensive income (loss) before reclassifications	0	0	0		(1)
Amounts reclassified from accumulated other comprehensive income (loss)	0	0	0		0
Total other comprehensive income (loss), net of tax	0	0	0		(1)
Ending balance	(1)	(4)	(1)		(4)
Unrealized Net Gains (Losses) on Derivative Instruments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(2)	137	13		47
Other comprehensive income (loss) before reclassifications	65	165	75		271
Amounts reclassified from accumulated other comprehensive income (loss)	(9)	(56)	(34)		(72)
Total other comprehensive income (loss), net of tax	56	109	41		199
Ending balance	54	246	54		246
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(72)	(62)	(79)		(29)
Other comprehensive income (loss) before reclassifications	(15)	(43)	(8)		(76)
Amounts reclassified from accumulated other comprehensive income (loss)	0	0	0		0
Total other comprehensive income (loss), net of tax	(15)	(43)	(8)		(76)
Ending balance	$ (87)	$ (105)	$ (87)		$ (105)

[1] Derived from audited Consolidated Financial Statements.