Equity Narratives (Details) (USD $)	0 Months Ended		12 Months Ended
	Sep. 07, 2008	Sep. 08, 2008	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Class of Stock [Line Items]
Common stock outstanding			1,158,082,750	1,158,080,657
Percentage of common shares attributable to warrants issued to Treasury as a percentage to total diluted common shares upon exercise of the right			79.90%
Capital Reserve Amount, current Year, Senior Preferred Stock Purchase Agreement, Amendment			$ 2,400,000,000
Aggregate funding received from US Treasury pursuant to the senior preferred stock purchase agreement			116,100,000,000
Dividends declared on our senior preferred stock			20,594,000,000	82,452,000,000	11,608,000,000
Capital Reserve Amount, Prior year, Senior Preferred Stock Purchase Agreement, Amendment			3,000,000,000
Capital reserve amount for the next fiscal year based on the amended Senior Preferred Stock Purchase agreement			1,800,000,000
Annual reduction of capital reserve from 2013 to 2018 based on the Senior Preferred Stock Purchase Agreement, Amendment			600,000,000
Capital reserve amount on January 2018			0
Convertible Series 2004-1 Preferred Stock [Member]
Class of Stock [Line Items]
Conversion price per share			$ 94.31
Conversion rate			1,060.3329
Preferred stock redemption price per share			$ 105,000
Series 2008-2 Senior Preferred Stock [Member]
Class of Stock [Line Items]
Shares of variable liquidation preference senior preferred stock issued	1,000,000
Aggregate liquidation preference of senior preferred stock		1,000,000,000
Value assigned to Treasury's commitment and recorded as a reduction to additional paid-in-capital		4,500,000,000
Senior preferred stock liquidation preference per share		$ 1,000	$ 117,149
Dividends declared on our senior preferred stock			20,600,000,000	82,500,000,000	11,600,000,000
Preferred Stock Covenant Maximum Fair Market Value of assets and properties per transaction			250,000,000
Preferred Stock, Covenant, Maximum Aggregate Debt Amount, Current Period			663,000,000,000
Preferred Stock, Covenant, Current Period Debt v.s. Maximum Mortgage Assets Allowed at Prior Year End, Maximum Ratio			120.00%
Preferred Stock, Covenant, Maximum Mortgage Assets			469,600,000,000.0
Preferred Stock, Covenant, Mortgage Assets at Year End, Maximum Ratio of Proceeding Year End			85.00%
Preferred Stock, Covenant, Mortgage Asset Floor Amount			250,000,000,000.0
Minimum [Member] | Series O Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock redemption price per share			$ 50
Minimum [Member] | Series 2008-2 Senior Preferred Stock [Member]
Class of Stock [Line Items]
FHFA Request, Covenant, Mortgage Assets at Year End, Minimum Ratio of Proceeding Year End			90.00%
Maximum [Member] | Series O Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock redemption price per share			$ 52.5
Maximum [Member] | Series 2008-2 Senior Preferred Stock [Member]
Class of Stock [Line Items]
FHFA Request, Covenant, Mortgage Assets at Year End, Minimum Ratio of Proceeding Year End			95.00%
US Treasury [Member]
Class of Stock [Line Items]
Percentage of common shares attributable to warrants issued to Treasury as a percentage to total diluted common shares upon exercise of the right	79.90%		79.90%
Aggregate liquidation preference of senior preferred stock			117,100,000,000
Capital Reserve Amount, current Year, Senior Preferred Stock Purchase Agreement, Amendment			2,400,000,000	3,000,000,000
Aggregate funding received from US Treasury pursuant to the senior preferred stock purchase agreement			116,100,000,000	116,100,000,000
Capital reserve amount for the next fiscal year based on the amended Senior Preferred Stock Purchase agreement			1,800,000,000
Annual reduction of capital reserve from 2013 to 2018 based on the Senior Preferred Stock Purchase Agreement, Amendment			600,000,000
Common stock warrant exercise price per share	0.00001
Initial aggregate liquidation preference of senior preferred stock held by US Treasury			1,000,000,000
Total remaining funding available from US Treasury pursuant to the senior preferred stock agreement			$ 117,600,000,000