LOANS (Details 4) (Consumer, USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014 loan		Sep. 30, 2013 loan		Sep. 30, 2014 loan		Sep. 30, 2013 loan
Loans receivable
Period within which default occurred post-modification					1 year
Number of days past due, non-accrual status					60 days		60 days
Commercial market loans
Loans receivable
Number of days past due, non-accrual status					90 days		90 days
In North America Offices
Loans receivable
Number of loans modified	67,074	[1]	67,573	[1]	194,261	[1]	199,137	[1]
Post-modification recorded investment	$ 1,005	[1],[2],[3]	$ 1,335	[1],[2],[4]	$ 2,991	[1],[5],[6]	$ 4,769	[1],[5],[6]
Deferred principal	16	[1],[7]	28	[1],[7]	46	[1],[7]	46	[1],[7]
Contingent principal forgiveness	11	[8]	15	[1],[8]	30	[1],[8]	17	[1],[8]
Principal forgiveness	4	[1],[9]	67	[1],[9]	21	[1],[9]	207	[1],[9]
Loans in default	239		556		839		1,601
In North America Offices | Residential first mortgages
Loans receivable
Number of loans modified	4,933		7,375		15,435		25,757
Post-modification recorded investment	626	[2],[3]	933	[2],[4]	1,866	[5],[6]	3,387	[5],[6]
Deferred principal	15	[7]	28	[7]	43	[7]	45	[7]
Contingent principal forgiveness	11	[8]	15	[8]	30	[8]	17	[8]
Principal forgiveness	1	[9]	34	[9]	7	[9]	136	[9]
Average interest rate reduction (as a percent)	1.00%		1.00%		1.00%		1.00%
Post-modification recorded investment for borrowers that have gone through Chapter 7 bankruptcy	74		138		240		387
Loans in default	149		440		562		1,221
In North America Offices | Residential first mortgages | New OCC guidance
Loans receivable
Post-modification recorded investment for borrowers that have gone through Chapter 7 bankruptcy	45		87		144		265
In North America Offices | Home equity loans
Loans receivable
Number of loans modified	1,900		2,962		6,102		10,319
Post-modification recorded investment	76	[2],[3]	90	[2],[4]	228	[5],[6]	460	[5],[6]
Deferred principal	1		0	[7]	3	[7]	1	[7]
Principal forgiveness	2	[9]	33	[9]	13	[9]	71	[9]
Average interest rate reduction (as a percent)	3.00%		1.00%		2.00%		1.00%
Post-modification recorded investment for borrowers that have gone through Chapter 7 bankruptcy	22		30		65		75
Loans in default	16		52		55		155
In North America Offices | Home equity loans | New OCC guidance
Loans receivable
Post-modification recorded investment for borrowers that have gone through Chapter 7 bankruptcy	19		24		56		62
In North America Offices | Credit cards
Loans receivable
Number of loans modified	48,775		43,312		136,501		123,073
Post-modification recorded investment	211	[2],[3]	207	[2],[4]	601	[5],[6]	613	[5],[6]
Average interest rate reduction (as a percent)	16.00%		14.00%		15.00%		14.00%
Loans in default	47		41		146		155
In North America Offices | Installment and other
Loans receivable
Number of loans modified	11,420		13,880		36,086		39,822
Post-modification recorded investment	87	[2],[3]	99	[2],[4]	269	[5],[6]	284	[5],[6]
Average interest rate reduction (as a percent)	6.00%		6.00%		6.00%		7.00%
Loans in default	26		22		68		67
In North America Offices | Commercial market loans
Loans receivable
Number of loans modified	46	[10]	44	[10]	137	[10]	166	[10]
Post-modification recorded investment	5	[10],[2],[3]	6	[10],[2],[4]	27	[10],[5],[6]	25	[10],[5],[6]
Principal forgiveness	1	[9]			1	[10],[9]
Loans in default	1		1		8		3
In offices outside North America
Loans receivable
Number of loans modified	56,808	[1]	60,145	[1]	155,625	[1]	152,214	[1]
Post-modification recorded investment	253	[1],[2],[3]	280	[1],[2],[4]	817	[1],[5],[6]	866	[1],[5],[6]
Deferred principal	0	[1],[7]	1	[1],[7]	0	[1],[7]	2	[1],[7]
Contingent principal forgiveness	0	[1],[8]	0	[1],[8]	0	[1],[8]	0	[1],[8]
Principal forgiveness	14	[1],[9]	11	[1],[9]	40	[1],[9]	22	[1],[9]
Loans in default	85		82		372		276
In offices outside North America | Residential first mortgages
Loans receivable
Number of loans modified	841		733		2,127		2,914
Post-modification recorded investment	30	[2],[3]	30	[2],[4]	79	[5],[6]	135	[5],[6]
Principal forgiveness	0	[9]	1	[9]	1	[9]	2	[9]
Average interest rate reduction (as a percent)	0.00%		1.00%		1.00%		1.00%
Loans in default	6		11		16		43
In offices outside North America | Home equity loans
Loans receivable
Number of loans modified	15		44		53		48
Post-modification recorded investment	3	[2],[3]	1	[2],[4]	9	[5],[6]	1	[5],[6]
Average interest rate reduction (as a percent)			1.00%
In offices outside North America | Credit cards
Loans receivable
Number of loans modified	40,848		43,660		109,079		105,850
Post-modification recorded investment	125	[2],[3]	138	[2],[4]	357	[5],[6]	394	[5],[6]
Principal forgiveness	10	[9]	7	[9]	28	[9]	13	[9]
Average interest rate reduction (as a percent)	12.00%		12.00%		13.00%		14.00%
Loans in default	53		44		175		146
In offices outside North America | Installment and other
Loans receivable
Number of loans modified	15,053		15,620		44,095		43,106
Post-modification recorded investment	73	[2],[3]	81	[2],[4]	216	[5],[6]	260	[5],[6]
Principal forgiveness	4	[9]	3	[9]	11	[9]	7	[9]
Average interest rate reduction (as a percent)	10.00%		8.00%		10.00%		8.00%
Loans in default	24		22		79		78
In offices outside North America | Commercial market loans
Loans receivable
Number of loans modified	51	[10]	88	[10]	271	[10]	296	[10]
Post-modification recorded investment	22	[10],[2],[3]	30	[10],[2],[4]	156	[10],[5],[6]	76	[10],[5],[6]
Deferred principal			1	[10],[7]			2	[10],[7]
Average interest rate reduction (as a percent)	0.00%
Loans in default	$ 2		$ 5		$ 102		$ 9

[1] The above tables reflect activity for loans outstanding as of the end of the reporting period that were considered TDRs.

[2] Post-modification balances include past due amounts that are capitalized at the modification date.

[3] Post-modification balances in North America include $74 million of residential first mortgages and $22 million of home equity loans to borrowers who have gone through Chapter 7 bankruptcy in the three months ended September 30, 2014. These amounts include $45 million of residential first mortgages and $19 million of home equity loans that are newly classified as TDRs in the three months ended September 30, 2014 as a result of OCC guidance, as described above.

[4] Post-modification balances in North America include $138 million of residential first mortgages and $30 million of home equity loans to borrowers who have gone through Chapter 7 bankruptcy in the three months ended September 30, 2013. These amounts include $87 million of residential first mortgages and $24 million of home equity loans that are newly classified as TDRs in the three months ended September 30, 2013 as a result of OCC guidance, as described above.

[5] Post-modification balances in North America include $240 million of residential first mortgages and $65 million of home equity loans to borrowers who have gone through Chapter 7 bankruptcy in the nine months ended September 30, 2014. These amounts include $144 million of residential first mortgages and $56 million of home equity loans that are newly classified as TDRs as a result of OCC guidance received in the nine months ended September 30, 2014, as described above.

[6] Post-modification balances include past due amounts that are capitalized at modification date.

[7] Represents portion of contractual loan principal that is non-interest bearing but still due from the borrower. Such deferred principal is charged off at the time of permanent modification to the extent that the related loan balance exceeds the underlying collateral value.

[8] Represents portion of contractual loan principal that is non-interest bearing and, depending upon borrower performance, eligible for forgiveness.

[9] Represents portion of contractual loan principal that was forgiven at the time of permanent modification.

[10] Commercial markets loans are generally borrower-specific modifications and incorporate changes in the amount and/or timing of principal and/or interest.