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Changes in Accumulated Other Comprehensive Income by Component (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Accumulated other comprehensive income (loss), beginning balance $ 15 $ (50) $ (50)
Other comprehensive income (loss) before reclassifications 84 63 (25)
Amounts reclassified from accumulated other comprehensive income (loss) (166) 2 25
Total other comprehensive income (loss), net of tax (82) 65 0
Accumulated other comprehensive income (loss), ending balance (67) 15 (50)
Unrealized Net Gains (Losses) on Available-for-Sale Securities      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Accumulated other comprehensive income (loss), beginning balance (3) 0 (4)
Other comprehensive income (loss) before reclassifications 1 (3) 5
Amounts reclassified from accumulated other comprehensive income (loss) 1 0 (1)
Total other comprehensive income (loss), net of tax 2 (3) 4
Accumulated other comprehensive income (loss), ending balance (1) (3) 0
Unrealized Net Gains (Losses) on Derivative Instruments      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Accumulated other comprehensive income (loss), beginning balance 47 (29) 39
Other comprehensive income (loss) before reclassifications 133 74 (94)
Amounts reclassified from accumulated other comprehensive income (loss) (167) 2 26
Total other comprehensive income (loss), net of tax (34) 76 (68)
Accumulated other comprehensive income (loss), ending balance 13 47 (29)
Foreign Currency Translation Adjustments      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Accumulated other comprehensive income (loss), beginning balance (29) (21) (85)
Other comprehensive income (loss) before reclassifications (50) (8) 64
Amounts reclassified from accumulated other comprehensive income (loss) 0   0
Total other comprehensive income (loss), net of tax (50) (8) 64
Accumulated other comprehensive income (loss), ending balance $ (79) $ (29) $ (21)