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, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and financing receivables by origination year, Total	$ 24,664	$ 22,065
Manufactured Housing Loan Balances [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and financing receivables by origination year, 2022	5,747
Loans and financing receivables by origination year, 2021	3,639
Loans and financing receivables by origination year, 2020	2,839
Loans and financing receivables by origination year, 2019	2,000
Loans and financing receivables by origination year, 2018	1,515
Loans and financing receivables by origination year, Prior	7,005
Loans and financing receivables by origination year, Total	22,745
Performing [Member] | Manufactured Housing Loan Balances [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and financing receivables by origination year, 2022	5,743
Loans and financing receivables by origination year, 2021	3,630
Loans and financing receivables by origination year, 2020	2,830
Loans and financing receivables by origination year, 2019	1,992
Loans and financing receivables by origination year, 2018	1,509
Loans and financing receivables by origination year, Prior	6,959
Loans and financing receivables by origination year, Total	22,663
Non-Performing [Member] | Manufactured Housing Loan Balances [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and financing receivables by origination year, 2022	4
Loans and financing receivables by origination year, 2021	9
Loans and financing receivables by origination year, 2020	9
Loans and financing receivables by origination year, 2019	8
Loans and financing receivables by origination year, 2018	6
Loans and financing receivables by origination year, Prior	46
Loans and financing receivables by origination year, Total	$ 82