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Mortgage Loans Credit Quality Indicators - MF (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Financing Receivable, Credit Quality Indicator [Line Items]    
Total recorded investment in loans $ 3,745,661 $ 3,662,711
Financing Receivable, before Allowance for Credit Loss 3,741,684 3,659,247
Multifamily [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 391,867 377,426
Financing Receivable, Originated in Current Fiscal Year 11,295 72,014
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year 81,851 69,337
Financing Receivable, Originated Two Years before Latest Fiscal Year 68,815 63,616
Financing Receivable, Originated Three Years before Latest Fiscal Year 62,953 53,523
Financing Receivable, Originated Four Years before Latest Fiscal Year 52,785 44,753
Financing Receivable, Originated Five or More Years before Latest Fiscal Year 114,168 74,183
Doubtful [Member] | Multifamily [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 4 1
Pass | Multifamily [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 380,184 367,374
Financing Receivable, Originated in Current Fiscal Year 11,295 71,977
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year 81,647 68,296
Financing Receivable, Originated Two Years before Latest Fiscal Year 67,630 62,087
Financing Receivable, Originated Three Years before Latest Fiscal Year 61,280 50,907
Financing Receivable, Originated Four Years before Latest Fiscal Year 49,903 43,174
Financing Receivable, Originated Five or More Years before Latest Fiscal Year 108,429 70,933
Criticized | Multifamily [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing Receivable, before Allowance for Credit Loss 11,683 10,052
Financing Receivable, Originated in Current Fiscal Year 0 37
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year 204 1,041
Financing Receivable, Originated Two Years before Latest Fiscal Year 1,185 1,529
Financing Receivable, Originated Three Years before Latest Fiscal Year 1,673 2,616
Financing Receivable, Originated Four Years before Latest Fiscal Year 2,882 1,579
Financing Receivable, Originated Five or More Years before Latest Fiscal Year 5,739 3,250
Multifamily [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total recorded investment in loans $ 391,867 $ 377,426