v3.26.1
Income Taxes (Loss Carryforwards) (Details) - USD ($)
$ in Millions
Apr. 30, 2026
Apr. 30, 2025
Operating Loss Carryforwards [Line Items]    
Loss and Credit Carryforwards $ 170 $ 203
Deferred Tax Assets, Loss and Credit Carryforwards 64 57
Loss and Credit Carryforwards, Valuation Allowance (36) (25)
Interest Carryforwards 86 91
Deferred Tax Asset, Interest Carryforward 21 [1] 23
Interest Carryforwards, Valuation Allowance (2) (10)
Total Carryforwards 256 294
Deferred Tax Asset, Total Carryforwards 85 80
Total Carryforwards, Valuation Allowance (38) (35)
Domestic Tax Authority    
Operating Loss Carryforwards [Line Items]    
Loss and Credit Carryforwards 42 68
Deferred Tax Assets, Loss and Credit Carryforwards 38 [2] 31
Loss and Credit Carryforwards, Valuation Allowance (22) (10)
Domestic Tax Authority | Not Subject to Expiration [Member]    
Operating Loss Carryforwards [Line Items]    
Deferred Tax Assets, Loss and Credit Carryforwards 8  
Domestic Tax Authority | Subject to Expiration [Member]    
Operating Loss Carryforwards [Line Items]    
Deferred Tax Assets, Loss and Credit Carryforwards 30  
Foreign Tax Authority [Member]    
Operating Loss Carryforwards [Line Items]    
Loss and Credit Carryforwards 128 135
Deferred Tax Assets, Loss and Credit Carryforwards 26 [3] 26
Loss and Credit Carryforwards, Valuation Allowance (14) $ (15)
Foreign Tax Authority [Member] | Not Subject to Expiration [Member]    
Operating Loss Carryforwards [Line Items]    
Deferred Tax Assets, Loss and Credit Carryforwards 23  
Foreign Tax Authority [Member] | Subject to Expiration [Member]    
Operating Loss Carryforwards [Line Items]    
Deferred Tax Assets, Loss and Credit Carryforwards $ 3  
[1] The interest expense limitation carryforwards do not expire.
[2] As of April 30, 2026, the deferred tax asset amount includes credit carryforwards of $8 that do not expire and loss and credit carryforwards of $30 that expire in varying amounts from 2028 to 2051.
[3] As of April 30, 2026, the deferred tax asset includes loss carryforwards of $23 that do not expire and $3 that expire in varying amounts over the next 25 years.