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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, 2022
Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and financing receivables by origination year, Total $ 22,596 $ 22,065
Manufactured Housing Loan Balances [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and financing receivables by origination year, 2022 2,040  
Loans and financing receivables by origination year, 2021 3,921  
Loans and financing receivables by origination year, 2020 3,073  
Loans and financing receivables by origination year, 2019 2,177  
Loans and financing receivables by origination year, 2018 1,648  
Loans and financing receivables by origination year, Prior 7,835  
Loans and financing receivables by origination year, Total 20,694  
Performing [Member] | Manufactured Housing Loan Balances [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and financing receivables by origination year, 2022 2,038  
Loans and financing receivables by origination year, 2021 3,918  
Loans and financing receivables by origination year, 2020 3,065  
Loans and financing receivables by origination year, 2019 2,169  
Loans and financing receivables by origination year, 2018 1,642  
Loans and financing receivables by origination year, Prior 7,789  
Loans and financing receivables by origination year, Total 20,621  
Non-Performing [Member] | Manufactured Housing Loan Balances [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and financing receivables by origination year, 2022 2  
Loans and financing receivables by origination year, 2021 3  
Loans and financing receivables by origination year, 2020 8  
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 $ 73