SECURITIZATIONS AND VARIABLE INTEREST ENTITIES (Details 7) (USD $)			3 Months Ended					3 Months Ended
	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2012 Mortgage servicing rights:	Mar. 31, 2011 Mortgage servicing rights:	Mar. 31, 2012 Non-agency-sponsored mortgages	Mar. 31, 2012 Senior interests	Mar. 31, 2012 Subordinated interests	Mar. 31, 2012 U.S. government-sponsored agency guaranteed
Classification of Securitizations
Fair value of capitalized mortgage servicing rights			$ 2,700,000,000	$ 4,700,000,000
Principal amount of loans and other financial instruments			387,000,000,000	444,000,000,000
Re-securitizations
Balance at beginning of period	2,691,000,000	2,569,000,000	2,569,000,000	4,554,000,000
Originations			144,000,000	194,000,000
Changes in fair value of MSRs due to changes in inputs and assumptions			249,000,000	172,000,000
Other changes			(271,000,000)	(230,000,000)
Balance at end of period	2,691,000,000	2,569,000,000	2,691,000,000	4,690,000,000
Servicing fees			268,000,000	304,000,000
Late fees			17,000,000	21,000,000
Ancillary fees			28,000,000	28,000,000
Total MSR fees			313,000,000	353,000,000
Original par value of re-securitizations deals in which the entity holds a retained interest					7,300,000,000
Original par value of securities transferred to re-securitization entities					509,000,000
Market value of retained interest related to re-securitization transaction in 2012					74,000,000			754,000,000
Original fair value of re-securitizations deals in which the entity holds a retained interest	59,000,000,000
Securities transferred to re-securitization entities								7,400,000,000
Fair value of re-securitizations deals in which the entity holds a retained interest					$ 393,000,000	$ 32,000,000	$ 361,000,000	$ 2,100,000,000