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Long-duration insurance contracts - Summary of life, annuity and health insurance benefits liabilities (Detail) - USD ($)
$ in Millions
Mar. 31, 2025
Mar. 31, 2024
Liabilities for Guarantees on Long-Duration Contracts [Line Items]    
Life, annuity and health insurance benefits $ 17,734 $ 17,987
Periodic Payment Annuity [Member]    
Liabilities for Guarantees on Long-Duration Contracts [Line Items]    
Life, annuity and health insurance benefits 10,376 10,749
Life and Health [Member]    
Liabilities for Guarantees on Long-Duration Contracts [Line Items]    
Life, annuity and health insurance benefits 4,485 4,259
Other [Member]    
Liabilities for Guarantees on Long-Duration Contracts [Line Items]    
Life, annuity and health insurance benefits $ 2,873 $ 2,979