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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, 2024 | Dec. 31, 2023
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and financing receivables by origination year, Total | $ 27,082 | $ 26,289
Manufactured Housing Loan Balances [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and financing receivables by origination year, 2024 | 1,973 |
Loans and financing receivables by origination year, 2023 | 5,442 |
Loans and financing receivables by origination year, 2022 | 3,905 |
Loans and financing receivables by origination year, 2021 | 3,274 |
Loans and financing receivables by origination year, 2020 | 2,535 |
Loans and financing receivables by origination year, Prior | 9,040 |
Loans and financing receivables by origination year, Total | 26,169 |
Performing [Member] | Manufactured Housing Loan Balances [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and financing receivables by origination year, 2024 | 1,971 |
Loans and financing receivables by origination year, 2023 | 5,432 |
Loans and financing receivables by origination year, 2022 | 3,892 |
Loans and financing receivables by origination year, 2021 | 3,258 |
Loans and financing receivables by origination year, 2020 | 2,523 |
Loans and financing receivables by origination year, Prior | 8,980 |
Loans and financing receivables by origination year, Total | 26,056 |
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 | 10 |
Loans and financing receivables by origination year, 2022 | 13 |
Loans and financing receivables by origination year, 2021 | 16 |
Loans and financing receivables by origination year, 2020 | 12 |
Loans and financing receivables by origination year, Prior | 60 |
Loans and financing receivables by origination year, Total | $ 113 |

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