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Accumulated Other Comprehensive Income (Loss) - Changes in Accumulated Other Comprehensive Income by Component (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Accumulated other comprehensive income (loss), beginning balance $ (67) $ 15 $ (50)
Other comprehensive income (loss) before reclassifications 43 84 63
Amounts reclassified from accumulated other comprehensive income (loss) (48) (166) 2
Total other comprehensive income (loss), net of tax (5) (82) 65
Accumulated other comprehensive income (loss), ending balance (72) (67) 15
Unrealized Net Gains (Losses) on Available-for-Sale Securities      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Accumulated other comprehensive income (loss), beginning balance (1) (3) 0
Other comprehensive income (loss) before reclassifications 1 1 (3)
Amounts reclassified from accumulated other comprehensive income (loss) 0 1 0
Total other comprehensive income (loss), net of tax 1 2 (3)
Accumulated other comprehensive income (loss), ending balance 0 (1) (3)
Unrealized Net Gains (Losses) on Derivative Instruments      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Accumulated other comprehensive income (loss), beginning balance 13 47 (29)
Other comprehensive income (loss) before reclassifications 45 133 74
Amounts reclassified from accumulated other comprehensive income (loss) (48) (167) 2
Total other comprehensive income (loss), net of tax (3) (34) 76
Accumulated other comprehensive income (loss), ending balance 10 13 47
Foreign Currency Translation Adjustments      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Accumulated other comprehensive income (loss), beginning balance (79) (29) (21)
Other comprehensive income (loss) before reclassifications (3) (50) (8)
Amounts reclassified from accumulated other comprehensive income (loss) 0   0
Total other comprehensive income (loss), net of tax (3) (50) (8)
Accumulated other comprehensive income (loss), ending balance $ (82) $ (79) $ (29)