Subsequent Events (Details) (USD $)	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Subsequent Event [Line Items]
Proceeds from sale of business units, net	$ 2,829,000,000	[1]	$ 29,000,000	[1]
Unpaid Principal Balance of Agency MSRs	115,000,000,000
Proceeds from Sale of MSRs	850,000,000
Series F-2 Preferred Stock [Member]
Subsequent Event [Line Items]
Cash dividend per share	$ 1.125
Preferred stock dividend amount outstanding	134,000,000
Series G Preferred Stock [Member]
Subsequent Event [Line Items]
Cash dividend per share	$ 17.50
Preferred stock dividend amount outstanding	45,000,000
Series A Preferred Stock [Member]
Subsequent Event [Line Items]
Cash dividend per share	$ 0.53
Preferred stock dividend amount outstanding	22,000,000
Automotive finance operations [Member]
Subsequent Event [Line Items]
Total Proceeds Received from Divestiture of Businesses	2,600,000,000
Proceeds from sale of business units, net	2,400,000,000
Noncash or Part Noncash Divestiture, Amount of Consideration Received	$ 190,000,000

[1] The amounts are net of cash and cash equivalents of $905 million at March 31, 2013 and $64 million at March 31, 2012 of business units at the time of disposition.