Condensed Consolidated Statements of Operations and Comprehensive Income (Unaudited) (Parenthetical) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Mortgage loans (includes $25,033 and $23,866, respectively, for the three months ended and $49,987 and $48,492, respectively, for the six months ended related to consolidated trusts)	$ 27,011	$ 26,256	$ 54,058	$ 53,217
Long-term debt (includes $20,705 and $19,521, respectively, for the three months ended and $41,013 and $40,179, respectively, for the six months ended related to consolidated trusts)	22,334	21,257	44,328	43,769
Consolidated Trusts [Member]
Mortgage loans (includes $25,033 and $23,866, respectively, for the three months ended and $49,987 and $48,492, respectively, for the six months ended related to consolidated trusts)	25,033	23,866	49,987	48,492
Long-term debt (includes $20,705 and $19,521, respectively, for the three months ended and $41,013 and $40,179, respectively, for the six months ended related to consolidated trusts)	$ 20,705	$ 19,521	$ 41,013	$ 40,179