Asset Quality (Consumer Real Estate Secured Asset Quality Indicators) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013
Financing Receivable, Recorded Investment [Line Items]
Purchased impaired loans	$ 5,557	$ 6,106	$ 6,778
Pennsylvania [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage Of Higher Risk Loans	12.00%	12.00%
New Jersey [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage Of Higher Risk Loans	14.00%	13.00%
Illinois [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage Of Higher Risk Loans	11.00%	12.00%
Percentage Of Purchased Impaired Loans	11.00%	11.00%
Ohio [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage Of Higher Risk Loans	11.00%	11.00%
Percentage Of Purchased Impaired Loans	8.00%	8.00%
California [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage Of Higher Risk Loans	4.00%	4.00%
Percentage Of Purchased Impaired Loans	17.00%	17.00%
Florida [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage Of Higher Risk Loans	8.00%	9.00%
Percentage Of Purchased Impaired Loans	15.00%	16.00%
Maryland [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage Of Higher Risk Loans	5.00%	5.00%
Michigan [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage Of Higher Risk Loans	5.00%	5.00%
Percentage Of Purchased Impaired Loans	5.00%	5.00%
North Carolina [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage Of Higher Risk Loans	4.00%
Percentage Of Purchased Impaired Loans	7.00%	8.00%
All Other States Maximum [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage Of Higher Risk Loans	4.00%	4.00%
Percentage Of Purchased Impaired Loans	4.00%	4.00%
All Other States [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage Of Higher Risk Loans	26.00%	29.00%
Percentage Of Purchased Impaired Loans	37.00%	35.00%
Home Equity [Member] | 1st Liens
Financing Receivable, Recorded Investment [Line Items]
Loans - Excluding Purchased Impaired Loans	17,570	17,654
Purchased Impaired Loans - Outstanding Balance	297	312
Home Equity [Member] | 2nd Liens
Financing Receivable, Recorded Investment [Line Items]
Loans - Excluding Purchased Impaired Loans	15,746	16,482
Purchased Impaired Loans - Outstanding Balance	2,046	2,211
Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans - Excluding Purchased Impaired Loans	10,250	10,240
Purchased Impaired Loans - Outstanding Balance	2,777	3,025
Government insured or guaranteed residential real estate mortgages	1,382	1,704
Total home equity and residential real estate loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans - Excluding Purchased Impaired Loans	43,566	44,376
Purchased Impaired Loans - Outstanding Balance	5,120	5,548
Government insured or guaranteed residential real estate mortgages	1,382	1,704
Purchased impaired loans	5,078	5,432
LTV greater than or equal to 125% and updated FICO scores | FICO greater than 660 | Home Equity [Member] | 1st Liens
Financing Receivable, Recorded Investment [Line Items]
Loans - Excluding Purchased Impaired Loans	400	438
Purchased Impaired Loans - Outstanding Balance	11	13
LTV greater than or equal to 125% and updated FICO scores | FICO greater than 660 | Home Equity [Member] | 2nd Liens
Financing Receivable, Recorded Investment [Line Items]
Loans - Excluding Purchased Impaired Loans	1,677	1,914
Purchased Impaired Loans - Outstanding Balance	350	435
LTV greater than or equal to 125% and updated FICO scores | FICO greater than 660 | Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans - Excluding Purchased Impaired Loans	457	563
Purchased Impaired Loans - Outstanding Balance	361	361
LTV greater than or equal to 125% and updated FICO scores | FICO greater than 660 | Total home equity and residential real estate loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans - Excluding Purchased Impaired Loans	2,534	2,915
Purchased Impaired Loans - Outstanding Balance	722	809
LTV greater than or equal to 125% and updated FICO scores | FICO less than or equal to 660 | Home Equity [Member] | 1st Liens
Financing Receivable, Recorded Investment [Line Items]
Loans - Excluding Purchased Impaired Loans	69	74
Purchased Impaired Loans - Outstanding Balance	10	15
LTV greater than or equal to 125% and updated FICO scores | FICO less than or equal to 660 | Home Equity [Member] | 2nd Liens
Financing Receivable, Recorded Investment [Line Items]
Loans - Excluding Purchased Impaired Loans	327	399
Purchased Impaired Loans - Outstanding Balance	169	215
LTV greater than or equal to 125% and updated FICO scores | FICO less than or equal to 660 | Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans - Excluding Purchased Impaired Loans	121	185
Purchased Impaired Loans - Outstanding Balance	230	296
LTV greater than or equal to 125% and updated FICO scores | FICO less than or equal to 660 | Total home equity and residential real estate loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans - Excluding Purchased Impaired Loans	517	658
Purchased Impaired Loans - Outstanding Balance	409	526
LTV greater than or equal to 125% and updated FICO scores | Missing FICO | Home Equity [Member] | 1st Liens
Financing Receivable, Recorded Investment [Line Items]
Loans - Excluding Purchased Impaired Loans	2	1
LTV greater than or equal to 125% and updated FICO scores | Missing FICO | Home Equity [Member] | 2nd Liens
Financing Receivable, Recorded Investment [Line Items]
Loans - Excluding Purchased Impaired Loans	11	11
Purchased Impaired Loans - Outstanding Balance	10	12
LTV greater than or equal to 125% and updated FICO scores | Missing FICO | Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans - Excluding Purchased Impaired Loans	10	20
Purchased Impaired Loans - Outstanding Balance	9	24
LTV greater than or equal to 125% and updated FICO scores | Missing FICO | Total home equity and residential real estate loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans - Excluding Purchased Impaired Loans	23	32
Purchased Impaired Loans - Outstanding Balance	19	36
LTV greater than or equal to 100% to less than 125% and updated FICO scores | FICO greater than 660 | Home Equity [Member] | 1st Liens
Financing Receivable, Recorded Investment [Line Items]
Loans - Excluding Purchased Impaired Loans	954	987
Purchased Impaired Loans - Outstanding Balance	16	21
LTV greater than or equal to 100% to less than 125% and updated FICO scores | FICO greater than 660 | Home Equity [Member] | 2nd Liens
Financing Receivable, Recorded Investment [Line Items]
Loans - Excluding Purchased Impaired Loans	2,520	2,794
Purchased Impaired Loans - Outstanding Balance	510	516
LTV greater than or equal to 100% to less than 125% and updated FICO scores | FICO greater than 660 | Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans - Excluding Purchased Impaired Loans	895	1,005
Purchased Impaired Loans - Outstanding Balance	333	373
LTV greater than or equal to 100% to less than 125% and updated FICO scores | FICO greater than 660 | Total home equity and residential real estate loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans - Excluding Purchased Impaired Loans	4,369	4,786
Purchased Impaired Loans - Outstanding Balance	859	910
LTV greater than or equal to 100% to less than 125% and updated FICO scores | FICO less than or equal to 660 | Home Equity [Member] | 1st Liens
Financing Receivable, Recorded Investment [Line Items]
Loans - Excluding Purchased Impaired Loans	126	150
Purchased Impaired Loans - Outstanding Balance	16	15
LTV greater than or equal to 100% to less than 125% and updated FICO scores | FICO less than or equal to 660 | Home Equity [Member] | 2nd Liens
Financing Receivable, Recorded Investment [Line Items]
Loans - Excluding Purchased Impaired Loans	427	501
Purchased Impaired Loans - Outstanding Balance	223	239
LTV greater than or equal to 100% to less than 125% and updated FICO scores | FICO less than or equal to 660 | Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans - Excluding Purchased Impaired Loans	181	210
Purchased Impaired Loans - Outstanding Balance	245	281
LTV greater than or equal to 100% to less than 125% and updated FICO scores | FICO less than or equal to 660 | Total home equity and residential real estate loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans - Excluding Purchased Impaired Loans	734	861
Purchased Impaired Loans - Outstanding Balance	484	535
LTV greater than or equal to 100% to less than 125% and updated FICO scores | Missing FICO | Home Equity [Member] | 1st Liens
Financing Receivable, Recorded Investment [Line Items]
Loans - Excluding Purchased Impaired Loans	2	2
LTV greater than or equal to 100% to less than 125% and updated FICO scores | Missing FICO | Home Equity [Member] | 2nd Liens
Financing Receivable, Recorded Investment [Line Items]
Loans - Excluding Purchased Impaired Loans	7	5
Purchased Impaired Loans - Outstanding Balance	13	14
LTV greater than or equal to 100% to less than 125% and updated FICO scores | Missing FICO | Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans - Excluding Purchased Impaired Loans	13	32
Purchased Impaired Loans - Outstanding Balance	8	14
LTV greater than or equal to 100% to less than 125% and updated FICO scores | Missing FICO | Total home equity and residential real estate loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans - Excluding Purchased Impaired Loans	22	39
Purchased Impaired Loans - Outstanding Balance	21	28
LTV greater than or equal to 90% to less than 100% and updated FICO scores | FICO greater than 660 | Home Equity [Member] | 1st Liens
Financing Receivable, Recorded Investment [Line Items]
Loans - Excluding Purchased Impaired Loans	959	1,047
Purchased Impaired Loans - Outstanding Balance	15	15
LTV greater than or equal to 90% to less than 100% and updated FICO scores | FICO greater than 660 | Home Equity [Member] | 2nd Liens
Financing Receivable, Recorded Investment [Line Items]
Loans - Excluding Purchased Impaired Loans	1,825	1,916
Purchased Impaired Loans - Outstanding Balance	205	202
LTV greater than or equal to 90% to less than 100% and updated FICO scores | FICO greater than 660 | Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans - Excluding Purchased Impaired Loans	815	844
Purchased Impaired Loans - Outstanding Balance	211	197
LTV greater than or equal to 90% to less than 100% and updated FICO scores | FICO greater than 660 | Total home equity and residential real estate loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans - Excluding Purchased Impaired Loans	3,599	3,807
Purchased Impaired Loans - Outstanding Balance	431	414
LTV greater than or equal to 90% to less than 100% and updated FICO scores | FICO less than or equal to 660 | Home Equity [Member] | 1st Liens
Financing Receivable, Recorded Investment [Line Items]
Loans - Excluding Purchased Impaired Loans	121	134
Purchased Impaired Loans - Outstanding Balance	10	12
LTV greater than or equal to 90% to less than 100% and updated FICO scores | FICO less than or equal to 660 | Home Equity [Member] | 2nd Liens
Financing Receivable, Recorded Investment [Line Items]
Loans - Excluding Purchased Impaired Loans	282	298
Purchased Impaired Loans - Outstanding Balance	94	101
LTV greater than or equal to 90% to less than 100% and updated FICO scores | FICO less than or equal to 660 | Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans - Excluding Purchased Impaired Loans	129	131
Purchased Impaired Loans - Outstanding Balance	146	163
LTV greater than or equal to 90% to less than 100% and updated FICO scores | FICO less than or equal to 660 | Total home equity and residential real estate loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans - Excluding Purchased Impaired Loans	532	563
Purchased Impaired Loans - Outstanding Balance	250	276
LTV greater than or equal to 90% to less than 100% and updated FICO scores | Missing FICO | Home Equity [Member] | 1st Liens
Financing Receivable, Recorded Investment [Line Items]
Loans - Excluding Purchased Impaired Loans	2	2
LTV greater than or equal to 90% to less than 100% and updated FICO scores | Missing FICO | Home Equity [Member] | 2nd Liens
Financing Receivable, Recorded Investment [Line Items]
Loans - Excluding Purchased Impaired Loans	4	3
Purchased Impaired Loans - Outstanding Balance	7	7
LTV greater than or equal to 90% to less than 100% and updated FICO scores | Missing FICO | Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans - Excluding Purchased Impaired Loans	12	22
Purchased Impaired Loans - Outstanding Balance	6	6
LTV greater than or equal to 90% to less than 100% and updated FICO scores | Missing FICO | Total home equity and residential real estate loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans - Excluding Purchased Impaired Loans	18	27
Purchased Impaired Loans - Outstanding Balance	13	13
LTV less than 90% and updated FICO scores | FICO greater than 660 | Home Equity [Member] | 1st Liens
Financing Receivable, Recorded Investment [Line Items]
Loans - Excluding Purchased Impaired Loans	13,611	13,445
Purchased Impaired Loans - Outstanding Balance	98	93
LTV less than 90% and updated FICO scores | FICO greater than 660 | Home Equity [Member] | 2nd Liens
Financing Receivable, Recorded Investment [Line Items]
Loans - Excluding Purchased Impaired Loans	7,701	7,615
Purchased Impaired Loans - Outstanding Balance	277	261
LTV less than 90% and updated FICO scores | FICO greater than 660 | Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans - Excluding Purchased Impaired Loans	6,909	6,309
Purchased Impaired Loans - Outstanding Balance	625	646
LTV less than 90% and updated FICO scores | FICO greater than 660 | Total home equity and residential real estate loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans - Excluding Purchased Impaired Loans	28,221	27,369
Purchased Impaired Loans - Outstanding Balance	1,000	1,000
LTV less than 90% and updated FICO scores | FICO less than or equal to 660 | Home Equity [Member] | 1st Liens
Financing Receivable, Recorded Investment [Line Items]
Loans - Excluding Purchased Impaired Loans	1,298	1,349
Purchased Impaired Loans - Outstanding Balance	116	126
LTV less than 90% and updated FICO scores | FICO less than or equal to 660 | Home Equity [Member] | 2nd Liens
Financing Receivable, Recorded Investment [Line Items]
Loans - Excluding Purchased Impaired Loans	949	1,009
Purchased Impaired Loans - Outstanding Balance	177	198
LTV less than 90% and updated FICO scores | FICO less than or equal to 660 | Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans - Excluding Purchased Impaired Loans	591	662
Purchased Impaired Loans - Outstanding Balance	551	590
LTV less than 90% and updated FICO scores | FICO less than or equal to 660 | Total home equity and residential real estate loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans - Excluding Purchased Impaired Loans	2,838	3,020
Purchased Impaired Loans - Outstanding Balance	844	914
LTV less than 90% and updated FICO scores | Missing FICO | Home Equity [Member] | 1st Liens
Financing Receivable, Recorded Investment [Line Items]
Loans - Excluding Purchased Impaired Loans	26	25
Purchased Impaired Loans - Outstanding Balance	1	1
LTV less than 90% and updated FICO scores | Missing FICO | Home Equity [Member] | 2nd Liens
Financing Receivable, Recorded Investment [Line Items]
Loans - Excluding Purchased Impaired Loans	16	17
Purchased Impaired Loans - Outstanding Balance	11	11
LTV less than 90% and updated FICO scores | Missing FICO | Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans - Excluding Purchased Impaired Loans	117	256
Purchased Impaired Loans - Outstanding Balance	21	47
LTV less than 90% and updated FICO scores | Missing FICO | Total home equity and residential real estate loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans - Excluding Purchased Impaired Loans	159	298
Purchased Impaired Loans - Outstanding Balance	33	59
Missing LTV and updated FICO scores | FICO greater than 660 | Home Equity [Member] | 1st Liens
Financing Receivable, Recorded Investment [Line Items]
Purchased Impaired Loans - Outstanding Balance	1	1
Missing LTV and updated FICO scores | FICO greater than 660 | Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans - Excluding Purchased Impaired Loans		1
Purchased Impaired Loans - Outstanding Balance	14	11
Missing LTV and updated FICO scores | FICO greater than 660 | Total home equity and residential real estate loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans - Excluding Purchased Impaired Loans		1
Purchased Impaired Loans - Outstanding Balance	15	12
Missing LTV and updated FICO scores | FICO less than or equal to 660 | Home Equity [Member] | 1st Liens
Financing Receivable, Recorded Investment [Line Items]
Purchased Impaired Loans - Outstanding Balance	3
Missing LTV and updated FICO scores | FICO less than or equal to 660 | Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Purchased Impaired Loans - Outstanding Balance	14	13
Missing LTV and updated FICO scores | FICO less than or equal to 660 | Total home equity and residential real estate loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Purchased Impaired Loans - Outstanding Balance	17	13
Missing LTV and updated FICO scores | Missing FICO | Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Purchased Impaired Loans - Outstanding Balance	3	3
Missing LTV and updated FICO scores | Missing FICO | Total home equity and residential real estate loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Purchased Impaired Loans - Outstanding Balance	$ 3	$ 3