BUSINESS SEGMENTS (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Segment Reporting Information [Line Items]
Net interest income	$ 820	$ 770	$ 2,461	$ 2,279
Noninterest income	341	383	1,339	1,253
Total revenue	1,161	1,153	3,800	3,532
Noninterest expense	810	788	2,568	6,861
Profit (loss) before provision for credit losses	351	365	1,232	(3,329)
Provision for credit losses	77	145	247	347
Income (loss) before income tax expense (benefit)	274	220	985	(3,676)
Income tax expense (benefit)	85	76	317	(98)
NET INCOME (LOSS)	189	144	668	(3,578)
Total Average Assets	128,691	117,386	126,598	121,026
Consumer Banking
Segment Reporting Information [Line Items]
Net interest income	532	543	1,615	1,633
Noninterest income	226	246	681	790
Total revenue	758	789	2,296	2,423
Noninterest expense	609	622	1,902	1,884
Profit (loss) before provision for credit losses	149	167	394	539
Provision for credit losses	66	87	195	243
Income (loss) before income tax expense (benefit)	83	80	199	296
Income tax expense (benefit)	29	28	69	104
NET INCOME (LOSS)	54	52	130	192
Total Average Assets	49,012	46,169	48,398	46,546
Commercial Banking
Segment Reporting Information [Line Items]
Net interest income	270	263	790	771
Noninterest income	104	93	318	284
Total revenue	374	356	1,108	1,055
Noninterest expense	162	156	472	471
Profit (loss) before provision for credit losses	212	200	636	584
Provision for credit losses	0	3	(7)	(21)
Income (loss) before income tax expense (benefit)	212	197	643	605
Income tax expense (benefit)	73	70	222	214
NET INCOME (LOSS)	139	127	421	391
Total Average Assets	38,854	35,019	37,951	34,938
Other
Segment Reporting Information [Line Items]
Net interest income	18	(36)	56	(125)
Noninterest income	11	44	340	179
Total revenue	29	8	396	54
Noninterest expense	39	10	194	4,506
Profit (loss) before provision for credit losses	(10)	(2)	202	(4,452)
Provision for credit losses	11	55	59	125
Income (loss) before income tax expense (benefit)	(21)	(57)	143	(4,577)
Income tax expense (benefit)	(17)	(22)	26	(416)
NET INCOME (LOSS)	(4)	(35)	117	(4,161)
Total Average Assets	$ 40,825	$ 36,198	$ 40,249	$ 39,542