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Loans and finance receivables - Summary of performing and non-performing home loans before discounts and credit loss allowances by year of loan origination (Detail) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and financing receivables by origination year, Total | $ 29,700 | $ 26,289
Manufactured Housing Loan Balances [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and financing receivables by origination year, 2024 | 6,591 |
Loans and financing receivables by origination year, 2023 | 4,991 |
Loans and financing receivables by origination year, 2022 | 3,667 |
Loans and financing receivables by origination year, 2021 | 3,063 |
Loans and financing receivables by origination year, 2020 | 2,368 |
Loans and financing receivables by origination year, Prior | 8,217 |
Loans and financing receivables by origination year, Total | 28,897 |
Performing [Member] | Manufactured Housing Loan Balances [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and financing receivables by origination year, 2024 | 6,578 |
Loans and financing receivables by origination year, 2023 | 4,969 |
Loans and financing receivables by origination year, 2022 | 3,651 |
Loans and financing receivables by origination year, 2021 | 3,052 |
Loans and financing receivables by origination year, 2020 | 2,358 |
Loans and financing receivables by origination year, Prior | 8,172 |
Loans and financing receivables by origination year, Total | 28,780 |
Non-Performing [Member] | Manufactured Housing Loan Balances [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and financing receivables by origination year, 2024 | 13 |
Loans and financing receivables by origination year, 2023 | 22 |
Loans and financing receivables by origination year, 2022 | 16 |
Loans and financing receivables by origination year, 2021 | 11 |
Loans and financing receivables by origination year, 2020 | 10 |
Loans and financing receivables by origination year, Prior | 45 |
Loans and financing receivables by origination year, Total | $ 117 |

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