v3.25.4
Derivative Instruments - Income Statement Impact of Derivative Instruments (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2025
Dec. 31, 2024
Derivative Instruments, Gain (Loss) [Line Items]        
Total gain/(loss) on derivative instruments $ (46) $ (551) $ 559 $ (351)
Interest rate swaps        
Derivative Instruments, Gain (Loss) [Line Items]        
Total gain/(loss) on derivative instruments (22) 7 24 (26)
Cross currency swaps        
Derivative Instruments, Gain (Loss) [Line Items]        
Total gain/(loss) on derivative instruments $ (24) $ (558) $ 535 $ (325)