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Loans and finance receivables - Summary of performing and non-performing home loans before discounts and allowances by year of loan origination (Detail) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and financing receivables by origination year, Total $ 30,186 $ 29,700
Manufactured Housing Loan Balances [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and financing receivables by origination year, 2025 1,830  
Loans and financing receivables by origination year, 2024 5,775  
Loans and financing receivables by origination year, 2023 4,882  
Loans and financing receivables by origination year, 2022 3,597  
Loans and financing receivables by origination year, 2021 2,999  
Loans and financing receivables by origination year, Prior 10,274  
Loans and financing receivables by origination year, Total 29,357  
Performing [Member] | Manufactured Housing Loan Balances [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and financing receivables by origination year, 2025 1,829  
Loans and financing receivables by origination year, 2024 5,764  
Loans and financing receivables by origination year, 2023 4,857  
Loans and financing receivables by origination year, 2022 3,579  
Loans and financing receivables by origination year, 2021 2,980  
Loans and financing receivables by origination year, Prior 10,204  
Loans and financing receivables by origination year, Total 29,213  
Non-Performing [Member] | Manufactured Housing Loan Balances [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and financing receivables by origination year, 2025 1  
Loans and financing receivables by origination year, 2024 11  
Loans and financing receivables by origination year, 2023 25  
Loans and financing receivables by origination year, 2022 18  
Loans and financing receivables by origination year, 2021 19  
Loans and financing receivables by origination year, Prior 70  
Loans and financing receivables by origination year, Total $ 144