XML 63 R80.htm IDEA: XBRL DOCUMENT v3.20.1
Affordable Housing Program (Narrative) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
Affordable Housing Program [Abstract]  
Affordable Housing Program, Contribution Requirement, Percentage 10.00%
Affordable Housing Program, Contribution Requirement, Amount $ 100