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Income Taxes - Operating Loss and Tax Credit Carryforwards (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Mar. 31, 2024
Federal    
Operating Loss Carryforwards [Line Items]    
Net operating loss carryforwards $ 0 $ 62
Net operating loss carryforward with no expiration 0 62
Net operating loss carryforward with expiration 0 0
Tax credit carryforwards 0 3
Tax credit carryforwards with no expiration 0 0
Tax credit carryforwards with expiration 0 3
Capital loss carryforwards 42 42
Capital loss carryforwards with no expiration 42 42
Capital loss carryforwards with expiration 0 0
State    
Operating Loss Carryforwards [Line Items]    
Net operating loss carryforwards 332 387
Net operating loss carryforward with no expiration 161 191
Net operating loss carryforward with expiration 171 196
Tax credit carryforwards 5 5
Tax credit carryforwards with no expiration 0 0
Tax credit carryforwards with expiration 5 5
Capital loss carryforwards 47 46
Capital loss carryforwards with no expiration 47 46
Capital loss carryforwards with expiration 0 0
Foreign    
Operating Loss Carryforwards [Line Items]    
Net operating loss carryforwards 10,369 10,211
Net operating loss carryforward with no expiration 5,402 5,359
Net operating loss carryforward with expiration 4,967 4,852
Tax credit carryforwards 2 2
Tax credit carryforwards with no expiration 0 0
Tax credit carryforwards with expiration 2 2
Capital loss carryforwards 34 30
Capital loss carryforwards with no expiration 34 30
Capital loss carryforwards with expiration $ 0 $ 0