v3.25.4
Fair Value Measurements - Summary of Fair Value Hierarchy of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Millions
Dec. 31, 2025
Mar. 31, 2025
Derivative instruments:    
Derivative assets $ 364 $ 3
Total assets 898 389
Derivative liabilities 158 691
Total liabilities 719 1,120
Interest rate swaps    
Derivative instruments:    
Derivative assets 351 338
Derivative liabilities 544 676
Cross currency swaps    
Derivative instruments:    
Derivative assets 547 51
Derivative liabilities 175 444
Level 1    
Derivative instruments:    
Total assets 0 0
Total liabilities 0 0
Level 1 | Interest rate swaps    
Derivative instruments:    
Derivative assets 0 0
Derivative liabilities 0 0
Level 1 | Cross currency swaps    
Derivative instruments:    
Derivative assets 0 0
Derivative liabilities 0 0
Level 2    
Derivative instruments:    
Total assets 898 389
Total liabilities 719 1,120
Level 2 | Interest rate swaps    
Derivative instruments:    
Derivative assets 351 338
Derivative liabilities 544 676
Level 2 | Cross currency swaps    
Derivative instruments:    
Derivative assets 547 51
Derivative liabilities 175 444
Level 3    
Derivative instruments:    
Total assets 0 0
Total liabilities 0 0
Level 3 | Interest rate swaps    
Derivative instruments:    
Derivative assets 0 0
Derivative liabilities 0 0
Level 3 | Cross currency swaps    
Derivative instruments:    
Derivative assets 0 0
Derivative liabilities $ 0 $ 0