Mortgage Loans Held For Investment, Net and Related Non-Recourse Collateralized Financing (Notes)	12 Months Ended
Dec. 31, 2019
Mortgage Loans Held for Investment, Net and Related Non-Recourse Collateralized Financing [Abstract]
Financing Receivables [Text Block]	MORTGAGE LOANS HELD FOR INVESTMENT, NET AND RELATED NON-RECOURSE COLLATERALIZED FINANCINGThe Company's mortgage loans held for investment, net are single-family mortgage loans which were originated or purchased by the Company prior to 2000. The amortized cost of these loans declined to $9,501 as of December 31, 2019 from $11,623 as of December 31, 2018 due primarily to principal payments. An allowance has been established for currently existing and probable losses on the Company's mortgage loans held for investment, which was $95 as of December 31, 2019 compared to $96 as of December 31, 2018. The Company's single-family mortgage loans are evaluated individually for impairment on a quarterly basis considering various factors including whether a loan is delinquent, the Company’s historical experience with similar types of loans, historical cure rates of delinquent loans, and historical and anticipated loss severity of the mortgage loans as they are liquidated. The Company recorded $120, $50, and $80 as provision for loan losses for the years ended December 31, 2019, 2018, and 2017, respectively, which is included within ”other operating income (expense), net” on the Company's consolidated statements of comprehensive income (loss).The majority of the Company's mortgage loans held for investment, net is pledged as collateral for the one remaining class of the Company's single-family securitization financing bond, which is recorded on the Company's balance sheet as "non-recourse collateralized financing". As of December 31, 2019, $3,452 of the principal balance of the Company’s mortgage loans held for investment was pledged as collateral for the Company's non-recourse collateralized financing which had a remaining principal balance of $2,764. As of December 31, 2018, $4,141 of the principal balance of the Company's mortgage loans held for investment was pledged as collateral for the remaining principal balance of the outstanding bonds of $3,502.

Mortgage Loans Held For Investment, Net and Related Non-Recourse Collateralized Financing (Notes)

12 Months Ended

Dec. 31, 2019

Mortgage Loans Held for Investment, Net and Related Non-Recourse Collateralized Financing [Abstract]

MORTGAGE LOANS HELD FOR INVESTMENT, NET AND RELATED NON-RECOURSE COLLATERALIZED FINANCINGThe Company's mortgage loans held for investment, net are single-family mortgage loans which were originated or purchased by the Company prior to 2000. The amortized cost of these loans declined to $9,501 as of December 31, 2019 from $11,623 as of December 31, 2018 due primarily to principal payments. An allowance has been established for currently existing and probable losses on the Company's mortgage loans held for investment, which was $95 as of December 31, 2019 compared to $96 as of December 31, 2018. The Company's single-family mortgage loans are evaluated individually for impairment on a quarterly basis considering various factors including whether a loan is delinquent, the Company’s historical experience with similar types of loans, historical cure rates of delinquent loans, and historical and anticipated loss severity of the mortgage loans as they are liquidated. The Company recorded $120, $50, and $80 as provision for loan losses for the years ended December 31, 2019, 2018, and 2017, respectively, which is included within ”other operating income (expense), net” on the Company's consolidated statements of comprehensive income (loss).The majority of the Company's mortgage loans held for investment, net is pledged as collateral for the one remaining class of the Company's single-family securitization financing bond, which is recorded on the Company's balance sheet as "non-recourse collateralized financing". As of December 31, 2019, $3,452 of the principal balance of the Company’s mortgage loans held for investment was pledged as collateral for the Company's non-recourse collateralized financing which had a remaining principal balance of $2,764. As of December 31, 2018, $4,141 of the principal balance of the Company's mortgage loans held for investment was pledged as collateral for the remaining principal balance of the outstanding bonds of $3,502.