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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 | Dec. 31, 2023 | Dec. 31, 2022
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and financing receivables by origination year, Total | $ 26,289 | $ 24,664
Manufactured Housing Loan Balances [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and financing receivables by origination year, 2023 | 5,724 |
Loans and financing receivables by origination year, 2022 | 4,379 |
Loans and financing receivables by origination year, 2021 | 3,338 |
Loans and financing receivables by origination year, 2020 | 2,587 |
Loans and financing receivables by origination year, 2019 | 1,831 |
Loans and financing receivables by origination year, Prior | 7,485 |
Loans and financing receivables by origination year, Total | 25,344 |
Performing [Member] | Manufactured Housing Loan Balances [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and financing receivables by origination year, 2023 | 5,716 |
Loans and financing receivables by origination year, 2022 | 4,368 |
Loans and financing receivables by origination year, 2021 | 3,321 |
Loans and financing receivables by origination year, 2020 | 2,575 |
Loans and financing receivables by origination year, 2019 | 1,820 |
Loans and financing receivables by origination year, Prior | 7,432 |
Loans and financing receivables by origination year, Total | 25,232 |
Non-Performing [Member] | Manufactured Housing Loan Balances [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and financing receivables by origination year, 2023 | 8 |
Loans and financing receivables by origination year, 2022 | 11 |
Loans and financing receivables by origination year, 2021 | 17 |
Loans and financing receivables by origination year, 2020 | 12 |
Loans and financing receivables by origination year, 2019 | 11 |
Loans and financing receivables by origination year, Prior | 53 |
Loans and financing receivables by origination year, Total | $ 112 |

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