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Revenue - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Mar. 31, 2025
Revenue from Contract with Customer [Abstract]          
Revenue, amount of remaining performance obligation $ 12,100   $ 12,100   $ 9,500
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]          
Contract with customer, liability, revenue recognized $ 1 $ 1 $ 12 $ 10  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-10-01          
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]          
Remaining performance obligation (as a percent) 65.00%   65.00%    
Remaining performance obligation, expected timing, period 12 months   12 months    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-10-01          
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]          
Remaining performance obligation (as a percent) 70.00%   70.00%    
Remaining performance obligation, expected timing, period 24 months   24 months