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Segment Reporting Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Segment Reporting, Asset Reconciling Item [Line Items]      
Assets $ 3,345,529 $ 3,287,968 $ 3,221,917
Operating Segments [Member] | Single-Family [Member]      
Segment Reporting, Asset Reconciling Item [Line Items]      
Assets 3,057,904 3,029,727 2,993,495
Operating Segments [Member] | Multifamily [Member]      
Segment Reporting, Asset Reconciling Item [Line Items]      
Assets $ 287,625 $ 258,241 $ 228,422