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Mortgage Loans Credit Quality Indicators - MF (Details) - USD ($)
Jun. 30, 2020
Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]    
Total recorded investment in loans $ 3,467,079,000,000 $ 3,336,929,000,000
Financing Receivable, before Allowance for Credit Loss 3,464,721,000,000 3,336,405,000,000
Multifamily [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 350,644,000,000  
Financing Receivable, Originated in Current Fiscal Year 29,928,000,000  
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year 69,756,000,000  
Financing Receivable, Originated Two Years before Latest Fiscal Year 64,409,000,000  
Financing Receivable, Originated Three Years before Latest Fiscal Year 54,986,000,000  
Financing Receivable, Originated Four Years before Latest Fiscal Year 46,877,000,000  
Financing Receivable, Originated Five or More Years before Latest Fiscal Year 84,688,000,000  
Doubtful [Member] | Multifamily [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss   5
Non-Classified [Member] | Multifamily [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 340,673,000,000 323,773,000,000
Financing Receivable, Originated in Current Fiscal Year 29,922,000,000  
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year 69,049,000,000  
Financing Receivable, Originated Two Years before Latest Fiscal Year 63,048,000,000  
Financing Receivable, Originated Three Years before Latest Fiscal Year 52,321,000,000  
Financing Receivable, Originated Four Years before Latest Fiscal Year 45,235,000,000  
Financing Receivable, Originated Five or More Years before Latest Fiscal Year 81,098,000,000  
Classified | Multifamily [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 9,971,000,000 6,845,000,000
Financing Receivable, Originated in Current Fiscal Year 6,000,000  
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year 707,000,000  
Financing Receivable, Originated Two Years before Latest Fiscal Year 1,361,000,000  
Financing Receivable, Originated Three Years before Latest Fiscal Year 2,665,000,000  
Financing Receivable, Originated Four Years before Latest Fiscal Year 1,642,000,000  
Financing Receivable, Originated Five or More Years before Latest Fiscal Year 3,590,000,000  
Internal Credit Risk    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss   330,618,000,000
Multifamily [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total recorded investment in loans $ 350,644,000,000 $ 330,618,000,000