Condensed Consolidated Statements of Operations and Comprehensive Income (Unaudited) (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Mortgage loans (includes $25,168 and $23,254, respectively, for the three months ended and $75,155 and $71,746, respectively, for the nine months ended related to consolidated trusts)	$ 27,047	$ 25,611	$ 81,105	$ 78,828
Long-term debt (includes $20,609 and $18,814, respectively, for the three months ended and $61,622 and $58,993, respectively, for the nine months ended related to consolidated trusts)	22,115	20,460	66,443	64,229
Consolidated Trusts [Member]
Mortgage loans (includes $25,168 and $23,254, respectively, for the three months ended and $75,155 and $71,746, respectively, for the nine months ended related to consolidated trusts)	25,168	23,254	75,155	71,746
Long-term debt (includes $20,609 and $18,814, respectively, for the three months ended and $61,622 and $58,993, respectively, for the nine months ended related to consolidated trusts)	$ 20,609	$ 18,814	$ 61,622	$ 58,993