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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 | Jun. 30, 2025 | Dec. 31, 2024
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and financing receivables by origination year, Total | $ 30,819 | $ 29,700
Manufactured Housing Loan Balances [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and financing receivables by origination year, 2025 | 3,195 |
Loans and financing receivables by origination year, 2024 | 5,666 |
Loans and financing receivables by origination year, 2023 | 4,757 |
Loans and financing receivables by origination year, 2022 | 3,517 |
Loans and financing receivables by origination year, 2021 | 2,927 |
Loans and financing receivables by origination year, Prior | 9,961 |
Loans and financing receivables by origination year, Total | 30,023 |
Performing [Member] | Manufactured Housing Loan Balances [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and financing receivables by origination year, 2025 | 3,193 |
Loans and financing receivables by origination year, 2024 | 5,651 |
Loans and financing receivables by origination year, 2023 | 4,738 |
Loans and financing receivables by origination year, 2022 | 3,499 |
Loans and financing receivables by origination year, 2021 | 2,911 |
Loans and financing receivables by origination year, Prior | 9,899 |
Loans and financing receivables by origination year, Total | 29,891 |
Non-Performing [Member] | Manufactured Housing Loan Balances [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and financing receivables by origination year, 2025 | 2 |
Loans and financing receivables by origination year, 2024 | 15 |
Loans and financing receivables by origination year, 2023 | 19 |
Loans and financing receivables by origination year, 2022 | 18 |
Loans and financing receivables by origination year, 2021 | 16 |
Loans and financing receivables by origination year, Prior | 62 |
Loans and financing receivables by origination year, Total | $ 132 |

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