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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, 2024 | Dec. 31, 2023
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and financing receivables by origination year, Total | $ 27,792 | $ 26,289
Manufactured Housing Loan Balances [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and financing receivables by origination year, 2024 | 3,481 |
Loans and financing receivables by origination year, 2023 | 5,213 |
Loans and financing receivables by origination year, 2022 | 3,822 |
Loans and financing receivables by origination year, 2021 | 3,199 |
Loans and financing receivables by origination year, 2020 | 2,476 |
Loans and financing receivables by origination year, Prior | 8,758 |
Loans and financing receivables by origination year, Total | 26,949 |
Performing [Member] | Manufactured Housing Loan Balances [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and financing receivables by origination year, 2024 | 3,479 |
Loans and financing receivables by origination year, 2023 | 5,207 |
Loans and financing receivables by origination year, 2022 | 3,814 |
Loans and financing receivables by origination year, 2021 | 3,189 |
Loans and financing receivables by origination year, 2020 | 2,468 |
Loans and financing receivables by origination year, Prior | 8,715 |
Loans and financing receivables by origination year, Total | 26,872 |
Non-Performing [Member] | Manufactured Housing Loan Balances [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and financing receivables by origination year, 2024 | 2 |
Loans and financing receivables by origination year, 2023 | 6 |
Loans and financing receivables by origination year, 2022 | 8 |
Loans and financing receivables by origination year, 2021 | 10 |
Loans and financing receivables by origination year, 2020 | 8 |
Loans and financing receivables by origination year, Prior | 43 |
Loans and financing receivables by origination year, Total | $ 77 |

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