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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, 2025 | Dec. 31, 2024
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and financing receivables by origination year, Total | $ 30,186 | $ 29,700
Manufactured Housing Loan Balances [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and financing receivables by origination year, 2025 | 1,830 |
Loans and financing receivables by origination year, 2024 | 5,775 |
Loans and financing receivables by origination year, 2023 | 4,882 |
Loans and financing receivables by origination year, 2022 | 3,597 |
Loans and financing receivables by origination year, 2021 | 2,999 |
Loans and financing receivables by origination year, Prior | 10,274 |
Loans and financing receivables by origination year, Total | 29,357 |
Performing [Member] | Manufactured Housing Loan Balances [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and financing receivables by origination year, 2025 | 1,829 |
Loans and financing receivables by origination year, 2024 | 5,764 |
Loans and financing receivables by origination year, 2023 | 4,857 |
Loans and financing receivables by origination year, 2022 | 3,579 |
Loans and financing receivables by origination year, 2021 | 2,980 |
Loans and financing receivables by origination year, Prior | 10,204 |
Loans and financing receivables by origination year, Total | 29,213 |
Non-Performing [Member] | Manufactured Housing Loan Balances [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and financing receivables by origination year, 2025 | 1 |
Loans and financing receivables by origination year, 2024 | 11 |
Loans and financing receivables by origination year, 2023 | 25 |
Loans and financing receivables by origination year, 2022 | 18 |
Loans and financing receivables by origination year, 2021 | 19 |
Loans and financing receivables by origination year, Prior | 70 |
Loans and financing receivables by origination year, Total | $ 144 |

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