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Loans and finance receivables - Summary of performing and non-performing manufactured housing loans before discounts and allowances by year of loan origination (Detail) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and financing receivables by origination year, Total $ 19,832 $ 18,199
Manufactured Housing Loan Balances [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and financing receivables by origination year, 2020 3,331  
Loans and financing receivables by origination year, 2019 2,607  
Loans and financing receivables by origination year, 2018 1,989  
Loans and financing receivables by origination year, 2017 1,478  
Loans and financing receivables by origination year, 2016 1,322  
Loans and financing receivables by origination year, Prior 6,967  
Loans and financing receivables by origination year, Total 17,694  
Performing [Member] | Manufactured Housing Loan Balances [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and financing receivables by origination year, 2020 3,328  
Loans and financing receivables by origination year, 2019 2,603  
Loans and financing receivables by origination year, 2018 1,983  
Loans and financing receivables by origination year, 2017 1,471  
Loans and financing receivables by origination year, 2016 1,314  
Loans and financing receivables by origination year, Prior 6,918  
Loans and financing receivables by origination year, Total 17,617  
Non-Performing [Member] | Manufactured Housing Loan Balances [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and financing receivables by origination year, 2020 3  
Loans and financing receivables by origination year, 2019 4  
Loans and financing receivables by origination year, 2018 6  
Loans and financing receivables by origination year, 2017 7  
Loans and financing receivables by origination year, 2016 8  
Loans and financing receivables by origination year, Prior 49  
Loans and financing receivables by origination year, Total $ 77