FAIR VALUE MEASUREMENT (Details 4) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Total nonrecurring fair value gains/losses	$ (546)	$ (145)	$ (1,144)	$ (238)
Fair value
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Total assets at fair value on a nonrecurring basis	10,044		10,044
Fair value | Loans held-for-sale
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Total assets at fair value on a nonrecurring basis	3,296		3,296
Fair value | Other real estate owned Loans
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Total assets at fair value on a nonrecurring basis	996		996
Fair value | Loans held for investment
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Total assets at fair value on a nonrecurring basis	5,752		5,752
Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Total assets at fair value on a nonrecurring basis	6,457		6,457
Level 2 | Loans held-for-sale
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Total assets at fair value on a nonrecurring basis	1,646		1,646
Level 2 | Other real estate owned Loans
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Total assets at fair value on a nonrecurring basis	60		60
Level 2 | Loans held for investment
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Total assets at fair value on a nonrecurring basis	4,751		4,751
Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Total assets at fair value on a nonrecurring basis	3,587		3,587
Level 3 | Loans held-for-sale
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Total assets at fair value on a nonrecurring basis	1,650		1,650
Level 3 | Other real estate owned Loans
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Total assets at fair value on a nonrecurring basis	936		936
Level 3 | Loans held for investment
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Total assets at fair value on a nonrecurring basis	1,001		1,001
Loans held-for-sale
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Total nonrecurring fair value gains/losses	(114)		(215)
Other real estate owned Loans
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Total nonrecurring fair value gains/losses	(56)		(74)
Loans held for investment
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Total nonrecurring fair value gains/losses	$ (376)		$ (855)