GUARANTEES AND COMMITMENTS (Details) (USD $)	Jun. 30, 2011	Dec. 31, 2010
Maximum potential amount of future payments
Expire Within One Year	$ 198,400,000,000	$ 174,000,000,000
Expire After One Year	121,600,000,000	118,600,000,000
Total amount outstanding	320,000,000,000	292,600,000,000
Carrying value	1,115,800,000,000	1,483,200,000,000
Allowance for credit losses relating to letters of credit and unfunded lending commitments	1,097,000,000	1,066,000,000
Cash collateral available to reimburse losses realized under guarantees and indemnifications	35,000,000,000	35,000,000,000
Securities and other marketable assets held as collateral, the majority of which collateral is held to reimburse losses realized under securities lending indemnifications	56,000,000,000	41,000,000,000
Letters of credit in favor of the Company held as collateral	1,400,000,000	2,000,000,000
Number of trusts funded by the reinsurer	2
Fair value of securities in trusts funded by reinsurer relating to indemnification	4,100,000,000	3,600,000,000
Financial standby letters of credit
Maximum potential amount of future payments
Expire Within One Year	29,500,000,000	26,400,000,000
Expire After One Year	69,300,000,000	68,400,000,000
Total amount outstanding	98,800,000,000	94,800,000,000
Carrying value	240,600,000	225,900,000
Financial standby letters of credit | Investment grade
Maximum potential amount of future payments
Total amount outstanding	69,300,000,000	58,700,000,000
Financial standby letters of credit | Non-investment grade
Maximum potential amount of future payments
Total amount outstanding	20,700,000,000	13,200,000,000
Financial standby letters of credit | Not rated
Maximum potential amount of future payments
Total amount outstanding	8,800,000,000	22,900,000,000
Performance guarantees
Maximum potential amount of future payments
Expire Within One Year	9,000,000,000	9,100,000,000
Expire After One Year	3,800,000,000	4,600,000,000
Total amount outstanding	12,800,000,000	13,700,000,000
Carrying value	46,100,000	35,800,000
Performance guarantees | Investment grade
Maximum potential amount of future payments
Total amount outstanding	7,300,000,000	7,000,000,000
Performance guarantees | Non-investment grade
Maximum potential amount of future payments
Total amount outstanding	3,000,000,000	3,400,000,000
Performance guarantees | Not rated
Maximum potential amount of future payments
Total amount outstanding	2,500,000,000	3,300,000,000
Derivative instruments considered to be guarantees
Maximum potential amount of future payments
Expire Within One Year	3,600,000,000	3,100,000,000
Expire After One Year	3,400,000,000	5,000,000,000
Total amount outstanding	7,000,000,000	8,100,000,000
Carrying value	715,100,000	850,400,000
Derivative instruments considered to be guarantees | Not rated
Maximum potential amount of future payments
Total amount outstanding	7,000,000,000	8,100,000,000
Loans sold with recourse
Maximum potential amount of future payments
Expire After One Year	500,000,000	400,000,000
Total amount outstanding	500,000,000	400,000,000
Carrying value	114,000,000	117,300,000
Repurchase reserve for Consumer mortgages representations and warranties	1,001,000,000	969,000,000
Increase in repurchase reserve due to 10% adverse change in significant assumptions	427,000,000
Loans sold with recourse | Not rated
Maximum potential amount of future payments
Total amount outstanding	500,000,000	400,000,000
Securities lending indemnifications
Maximum potential amount of future payments
Expire Within One Year	85,500,000,000	70,400,000,000
Total amount outstanding	85,500,000,000	70,400,000,000
Securities lending indemnifications | Not rated
Maximum potential amount of future payments
Total amount outstanding	85,500,000,000	70,400,000,000
Credit card merchant processing
Maximum potential amount of future payments
Expire Within One Year	70,800,000,000	65,000,000,000
Total amount outstanding	70,800,000,000	65,000,000,000
Credit card merchant processing | Not rated
Maximum potential amount of future payments
Total amount outstanding	70,800,000,000	65,000,000,000
Custody indemnifications and other
Maximum potential amount of future payments
Expire After One Year	44,600,000,000	40,200,000,000
Total amount outstanding	44,600,000,000	40,200,000,000
Carrying value		253,800,000
Custody indemnifications and other | Investment grade
Maximum potential amount of future payments
Total amount outstanding	44,600,000,000	40,200,000,000
Other guarantees and indemnifications
Maximum potential amount of future payments
Carrying value	1,100,000,000	1,500,000,000
Investment grade
Maximum potential amount of future payments
Total amount outstanding	121,200,000,000	105,900,000,000
Non-investment grade
Maximum potential amount of future payments
Total amount outstanding	23,700,000,000	16,600,000,000
Not rated
Maximum potential amount of future payments
Total amount outstanding	$ 175,100,000,000	$ 170,100,000,000