BASIS OF PRESENTATION (Details 2) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012 OCC Chapter 7 Bankruptcy Guidance	Sep. 30, 2012 OCC Chapter 7 Bankruptcy Guidance
New Accounting Pronouncements or Change in Accounting Principle
Incremental charge-offs due to implementation of new guidance	$ 3,551,000,000	$ 4,771,000,000	$ (40,000,000)	$ 635,000,000
Release of loan loss reserve due to implementation of new guidance	(308,000,000)	(194,000,000)		(600,000,000)
Net reduction in pretax income due to implementation of new guidance				35,000,000
Increase in TDRs resulted from implementation of new guidance				1,700,000,000
Increase in non-accrual loans resulted from implementation of new guidance				1,500,000,000
Increase in current non-accrual loans resulted from implementation of new guidance				1,300,000,000
Reserves released as a result of implementing the prohibition on valuation adjustments		125,000,000
Reduction in deferred asset cost as a result of adoption of new accounting standards for deferred asset acquisition costs		165,000,000
Deferred tax asset recorded as a result of adoption of new accounting standards for deferred asset acquisition costs		58,000,000
Change in opening retained earning as a result of adoption of new accounting standards for deferred asset acquisition costs		$ 107,000,000