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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
Jun. 30, 2021
Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and financing receivables by origination year, Total $ 21,281 $ 20,436
Manufactured Housing Loan Balances [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and financing receivables by origination year, 2021 2,817  
Loans and financing receivables by origination year, 2020 3,367  
Loans and financing receivables by origination year, 2019 2,388  
Loans and financing receivables by origination year, 2018 1,816  
Loans and financing receivables by origination year, 2017 1,347  
Loans and financing receivables by origination year, Prior 7,461  
Loans and financing receivables by origination year, Total 19,196  
Performing [Member] | Manufactured Housing Loan Balances [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and financing receivables by origination year, 2021 2,815  
Loans and financing receivables by origination year, 2020 3,365  
Loans and financing receivables by origination year, 2019 2,381  
Loans and financing receivables by origination year, 2018 1,810  
Loans and financing receivables by origination year, 2017 1,343  
Loans and financing receivables by origination year, Prior 7,420  
Loans and financing receivables by origination year, Total 19,134  
Non-Performing [Member] | Manufactured Housing Loan Balances [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and financing receivables by origination year, 2021 2  
Loans and financing receivables by origination year, 2020 2  
Loans and financing receivables by origination year, 2019 7  
Loans and financing receivables by origination year, 2018 6  
Loans and financing receivables by origination year, 2017 4  
Loans and financing receivables by origination year, Prior 41  
Loans and financing receivables by origination year, Total $ 62