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
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