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Consolidated Statements of Comprehensive Income - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2022
Statement of Comprehensive Income [Abstract]      
Net income $ 1,273 $ 802 $ 789
Other comprehensive income (loss), net of tax:      
Net gains (losses) on available-for-sale securities 1 2 (3)
Net gains (losses) on derivative instruments (3) (34) 76
Foreign currency translation adjustments (3) (50) (8)
Total other comprehensive income (loss), net of tax (5) (82) 65
Total comprehensive income $ 1,268 $ 720 $ 854