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Mortgage Loans Credit Quality Indicators - MF (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment in loans $ 3,209,506 $ 3,189,975
Multifamily [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment in loans 277,467 267,001
Multifamily [Member] | Non-Classified [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment in loans 273,064 263,416
Multifamily [Member] | Substandard [Member]    
Financing Receivable, Recorded Investment [Line Items]    
Total recorded investment in loans $ 4,403 $ 3,585