Business Changes and Accounting Developments (Details) (USD $) In Millions, except Share data, unless otherwise specified	9 Months Ended	0 Months Ended	9 Months Ended	0 Months Ended	3 Months Ended	10 Months Ended		0 Months Ended
	Sep. 30, 2013	Jun. 21, 2013 Flagstar	Sep. 30, 2013 Flagstar	May 08, 2013 Common Stock	Dec. 31, 2013 Common Stock	Nov. 11, 2013 Common Stock	Sep. 30, 2013 Deutsche Bank Agreement	Oct. 10, 2013 Below Investment Grade [Member] Deutsche Bank Agreement Subsequent Event [Member]	Jun. 05, 2013 Limited Liability Company [Member] Common Stock
Significant Transactions [Line Items]
Related Party Transaction, Previous Percentage of Ownership by Related Party									10.50%
Stock repurchase program, total authorized amount				$ 315	$ 400
Common stock repurchases (in shares)						12,500,000			5,000,000
Common stock repurchases	259.0					264.0			109.7
Stock Repurchased During Period, Average Price Per Share						$ 21.12
Proceeds from legal settlements		105	105
Number of terminated transactions								1
Net par outstanding amount	$ 6,002						$ 2,071	$ 294
Related Party Transaction, Number of Shares Held by Related Party									14,900,000
Related Party Transaction, Percentage of Ownership by Related Party									8.00%