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Segment Reporting (Policies)
3 Months Ended
Mar. 31, 2017
Segment Reporting [Abstract]  
Segment Reporting, Policy [Policy Text Block]
We have two reportable business segments: Single-Family and Multifamily. Previously, we had a third reportable business segment, Capital Markets, which was incorporated into the Single-Family and Multifamily segments in the fourth quarter of 2016. Results of our two business segments are intended to reflect each segment as if it were a stand-alone business. We have revised the presentation of our segment results for the prior period to be consistent with the current period presentation.