Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 204	$ 365
Other comprehensive income (loss), net of tax:
Net gains (losses) on available-for-sale securities	0	11
Net gains (losses) on derivative instruments	6	(37)
Foreign currency translation adjustments	9	24
Total other comprehensive income (loss), net of tax	15	(2)
Total comprehensive income (loss)	$ 219	$ 363