GUARANTEES AND COMMITMENTS (Details 2) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Credit Commitments
Credit Commitments	$ 882,398,000,000	$ 884,327,000,000
Commercial and similar letters of credit
Credit Commitments
Credit Commitments	7,045,000,000	7,311,000,000
One-to four-family residential mortgages
Credit Commitments
Credit Commitments	4,325,000,000	3,893,000,000
Revolving open-end loans secured by one- to four-family residential properties
Credit Commitments
Credit Commitments	18,141,000,000	18,176,000,000
Commercial real estate, construction and land development
Credit Commitments
Credit Commitments	3,154,000,000	3,496,000,000
Credit card lines
Credit Commitments
Credit Commitments	619,352,000,000	620,700,000,000
Commercial and other consumer loan commitments
Credit Commitments
Credit Commitments	227,861,000,000	228,492,000,000
Commercial and other consumer loan commitments, original maturity of less than one year	54,000,000,000	53,000,000,000
Other commitments and contingencies
Credit Commitments
Credit Commitments	2,520,000,000	2,259,000,000
U.S.
Credit Commitments
Credit Commitments	644,363,000,000
U.S. | Commercial and similar letters of credit
Credit Commitments
Credit Commitments	1,366,000,000
U.S. | One-to four-family residential mortgages
Credit Commitments
Credit Commitments	2,900,000,000
U.S. | Revolving open-end loans secured by one- to four-family residential properties
Credit Commitments
Credit Commitments	14,831,000,000
U.S. | Commercial real estate, construction and land development
Credit Commitments
Credit Commitments	1,852,000,000
U.S. | Credit card lines
Credit Commitments
Credit Commitments	483,589,000,000
U.S. | Commercial and other consumer loan commitments
Credit Commitments
Credit Commitments	138,454,000,000
U.S. | Other commitments and contingencies
Credit Commitments
Credit Commitments	1,371,000,000
Outside U.S.
Credit Commitments
Credit Commitments	238,035,000,000
Outside U.S. | Commercial and similar letters of credit
Credit Commitments
Credit Commitments	5,679,000,000
Outside U.S. | One-to four-family residential mortgages
Credit Commitments
Credit Commitments	1,425,000,000
Outside U.S. | Revolving open-end loans secured by one- to four-family residential properties
Credit Commitments
Credit Commitments	3,310,000,000
Outside U.S. | Commercial real estate, construction and land development
Credit Commitments
Credit Commitments	1,302,000,000
Outside U.S. | Credit card lines
Credit Commitments
Credit Commitments	135,763,000,000
Outside U.S. | Commercial and other consumer loan commitments
Credit Commitments
Credit Commitments	89,407,000,000
Outside U.S. | Other commitments and contingencies
Credit Commitments
Credit Commitments	$ 1,149,000,000