Asset Quality (Consumer Real Estate Secured Asset Quality Indicators) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Purchased Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Government insured or guaranteed residential real estate mortgages	$ 5,809	$ 6,156
Pennsylvania [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage Of Higher Risk Loans	11.00%	11.00%
New Jersey [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage Of Higher Risk Loans	13.00%	14.00%
Illinois [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage Of Higher Risk Loans	12.00%	11.00%
Illinois [Member] | Purchased Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage Of Purchased Impaired Loans	11.00%	12.00%
Ohio [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage Of Higher Risk Loans	10.00%	10.00%
Ohio [Member] | Purchased Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage Of Purchased Impaired Loans	7.00%	7.00%
California [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage Of Higher Risk Loans	6.00%	6.00%
California [Member] | Purchased Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage Of Purchased Impaired Loans	18.00%	18.00%
Florida [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage Of Higher Risk Loans	9.00%	9.00%
Florida [Member] | Purchased Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage Of Purchased Impaired Loans	15.00%	15.00%
Maryland [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage Of Higher Risk Loans	6.00%	6.00%
Michigan [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage Of Higher Risk Loans	6.00%	5.00%
Michigan [Member] | Purchased Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage Of Purchased Impaired Loans	5.00%	5.00%
North Carolina [Member] | Purchased Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage Of Purchased Impaired Loans	6.00%	6.00%
Georgia [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage Of Purchased Impaired Loans	4.00%
All Other States Maximum [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage Of Higher Risk Loans	4.00%	4.00%
All Other States Maximum [Member] | Purchased Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage Of Purchased Impaired Loans	4.00%	4.00%
All Other States [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage Of Higher Risk Loans	27.00%	28.00%
All Other States [Member] | Purchased Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Percentage Of Purchased Impaired Loans	34.00%	37.00%
Home Equity [Member] | 1st Liens
Financing Receivable, Recorded Investment [Line Items]
Loans Outstanding - Excluding Purchased Impaired Loans	16,606	14,904
Home Equity [Member] | 2nd Liens
Financing Receivable, Recorded Investment [Line Items]
Loans Outstanding - Excluding Purchased Impaired Loans	17,337	18,396
Home Equity [Member] | Purchased Impaired [Member] | 1st Liens
Financing Receivable, Recorded Investment [Line Items]
Purchased Impaired Loans - Outstanding Balance	329	338
Home Equity [Member] | Purchased Impaired [Member] | 2nd Liens
Financing Receivable, Recorded Investment [Line Items]
Purchased Impaired Loans - Outstanding Balance	2,428	2,649
Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Outstanding - Excluding Purchased Impaired Loans	9,429	9,425
Government insured or guaranteed residential real estate mortgages	2,012	2,279
Residential Real Estate [Member] | Purchased Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Purchased Impaired Loans - Outstanding Balance	3,337	3,651
Total home equity and residential real estate loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Outstanding - Excluding Purchased Impaired Loans	43,372	42,725
Purchased Impaired Loans - Outstanding Balance	6,094	6,638
Government insured or guaranteed residential real estate mortgages	2,012	2,279
Total home equity and residential real estate loans [Member] | Purchased Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Purchased Impaired Loans - Outstanding Balance	6,094	6,638
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 Outstanding - Excluding Purchased Impaired Loans	455	470
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 Outstanding - Excluding Purchased Impaired Loans	2,446	2,772
LTV greater than or equal to 125% and updated FICO scores | FICO greater than 660 | Home Equity [Member] | Purchased Impaired [Member] | 1st Liens
Financing Receivable, Recorded Investment [Line Items]
Purchased Impaired Loans - Outstanding Balance	15	17
LTV greater than or equal to 125% and updated FICO scores | FICO greater than 660 | Home Equity [Member] | Purchased Impaired [Member] | 2nd Liens
Financing Receivable, Recorded Investment [Line Items]
Purchased Impaired Loans - Outstanding Balance	673	791
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 Outstanding - Excluding Purchased Impaired Loans	778	667
LTV greater than or equal to 125% and updated FICO scores | FICO greater than 660 | Residential Real Estate [Member] | Purchased Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Purchased Impaired Loans - Outstanding Balance	488	597
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 Outstanding - Excluding Purchased Impaired Loans	3,679	3,909
LTV greater than or equal to 125% and updated FICO scores | FICO greater than 660 | Total home equity and residential real estate loans [Member] | Purchased Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Purchased Impaired Loans - Outstanding Balance	1,176	1,405
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 Outstanding - Excluding Purchased Impaired Loans	74	84
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 Outstanding - Excluding Purchased Impaired Loans	492	589
LTV greater than or equal to 125% and updated FICO scores | FICO less than or equal to 660 | Home Equity [Member] | Purchased Impaired [Member] | 1st Liens
Financing Receivable, Recorded Investment [Line Items]
Purchased Impaired Loans - Outstanding Balance	16	17
LTV greater than or equal to 125% and updated FICO scores | FICO less than or equal to 660 | Home Equity [Member] | Purchased Impaired [Member] | 2nd Liens
Financing Receivable, Recorded Investment [Line Items]
Purchased Impaired Loans - Outstanding Balance	316	405
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 Outstanding - Excluding Purchased Impaired Loans	245	211
LTV greater than or equal to 125% and updated FICO scores | FICO less than or equal to 660 | Residential Real Estate [Member] | Purchased Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Purchased Impaired Loans - Outstanding Balance	391	498
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 Outstanding - Excluding Purchased Impaired Loans	811	884
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] | Purchased Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Purchased Impaired Loans - Outstanding Balance	723	920
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 Outstanding - Excluding Purchased Impaired Loans	1	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 Outstanding - Excluding Purchased Impaired Loans	10	10
LTV greater than or equal to 125% and updated FICO scores | Missing FICO | Home Equity [Member] | Purchased Impaired [Member] | 2nd Liens
Financing Receivable, Recorded Investment [Line Items]
Purchased Impaired Loans - Outstanding Balance	17	23
LTV greater than or equal to 125% and updated FICO scores | Missing FICO | Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Outstanding - Excluding Purchased Impaired Loans	26	19
LTV greater than or equal to 125% and updated FICO scores | Missing FICO | Residential Real Estate [Member] | Purchased Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Purchased Impaired Loans - Outstanding Balance	31	46
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 Outstanding - Excluding Purchased Impaired Loans	37	30
LTV greater than or equal to 125% and updated FICO scores | Missing FICO | Total home equity and residential real estate loans [Member] | Purchased Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Purchased Impaired Loans - Outstanding Balance	48	69
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 Outstanding - Excluding Purchased Impaired Loans	1,057	1,027
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 Outstanding - Excluding Purchased Impaired Loans	3,308	3,636
LTV greater than or equal to 100% to less than 125% and updated FICO scores | FICO greater than 660 | Home Equity [Member] | Purchased Impaired [Member] | 1st Liens
Financing Receivable, Recorded Investment [Line Items]
Purchased Impaired Loans - Outstanding Balance	23	26
LTV greater than or equal to 100% to less than 125% and updated FICO scores | FICO greater than 660 | Home Equity [Member] | Purchased Impaired [Member] | 2nd Liens
Financing Receivable, Recorded Investment [Line Items]
Purchased Impaired Loans - Outstanding Balance	550	552
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 Outstanding - Excluding Purchased Impaired Loans	1,212	1,290
LTV greater than or equal to 100% to less than 125% and updated FICO scores | FICO greater than 660 | Residential Real Estate [Member] | Purchased Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Purchased Impaired Loans - Outstanding Balance	390	435
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 Outstanding - Excluding Purchased Impaired Loans	5,577	5,953
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] | Purchased Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Purchased Impaired Loans - Outstanding Balance	963	1,013
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 Outstanding - Excluding Purchased Impaired Loans	162	159
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 Outstanding - Excluding Purchased Impaired Loans	560	641
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] | Purchased Impaired [Member] | 1st Liens
Financing Receivable, Recorded Investment [Line Items]
Purchased Impaired Loans - Outstanding Balance	18	20
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] | Purchased Impaired [Member] | 2nd Liens
Financing Receivable, Recorded Investment [Line Items]
Purchased Impaired Loans - Outstanding Balance	246	269
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 Outstanding - Excluding Purchased Impaired Loans	244	253
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] | Purchased Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Purchased Impaired Loans - Outstanding Balance	323	383
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 Outstanding - Excluding Purchased Impaired Loans	966	1,053
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] | Purchased Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Purchased Impaired Loans - Outstanding Balance	587	672
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 Outstanding - Excluding Purchased Impaired Loans	2	3
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 Outstanding - Excluding Purchased Impaired Loans	6	6
LTV greater than or equal to 100% to less than 125% and updated FICO scores | Missing FICO | Home Equity [Member] | Purchased Impaired [Member] | 1st Liens
Financing Receivable, Recorded Investment [Line Items]
Purchased Impaired Loans - Outstanding Balance	1
LTV greater than or equal to 100% to less than 125% and updated FICO scores | Missing FICO | Home Equity [Member] | Purchased Impaired [Member] | 2nd Liens
Financing Receivable, Recorded Investment [Line Items]
Purchased Impaired Loans - Outstanding Balance	16	18
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 Outstanding - Excluding Purchased Impaired Loans	34	45
LTV greater than or equal to 100% to less than 125% and updated FICO scores | Missing FICO | Residential Real Estate [Member] | Purchased Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Purchased Impaired Loans - Outstanding Balance	18	23
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 Outstanding - Excluding Purchased Impaired Loans	42	54
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] | Purchased Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Purchased Impaired Loans - Outstanding Balance	35	41
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 Outstanding - Excluding Purchased Impaired Loans	1,076	1,056
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 Outstanding - Excluding Purchased Impaired Loans	2,095	2,229
LTV greater than or equal to 90% to less than 100% and updated FICO scores | FICO greater than 660 | Home Equity [Member] | Purchased Impaired [Member] | 1st Liens
Financing Receivable, Recorded Investment [Line Items]
Purchased Impaired Loans - Outstanding Balance	12	14
LTV greater than or equal to 90% to less than 100% and updated FICO scores | FICO greater than 660 | Home Equity [Member] | Purchased Impaired [Member] | 2nd Liens
Financing Receivable, Recorded Investment [Line Items]
Purchased Impaired Loans - Outstanding Balance	145	140
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 Outstanding - Excluding Purchased Impaired Loans	838	1,120
LTV greater than or equal to 90% to less than 100% and updated FICO scores | FICO greater than 660 | Residential Real Estate [Member] | Purchased Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Purchased Impaired Loans - Outstanding Balance	217	216
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 Outstanding - Excluding Purchased Impaired Loans	4,009	4,405
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] | Purchased Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Purchased Impaired Loans - Outstanding Balance	374	370
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 Outstanding - Excluding Purchased Impaired Loans	137	130
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 Outstanding - Excluding Purchased Impaired Loans	308	319
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] | Purchased Impaired [Member] | 1st Liens
Financing Receivable, Recorded Investment [Line Items]
Purchased Impaired Loans - Outstanding Balance	13	14
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] | Purchased Impaired [Member] | 2nd Liens
Financing Receivable, Recorded Investment [Line Items]
Purchased Impaired Loans - Outstanding Balance	89	99
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 Outstanding - Excluding Purchased Impaired Loans	148	164
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] | Purchased Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Purchased Impaired Loans - Outstanding Balance	162	182
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 Outstanding - Excluding Purchased Impaired Loans	593	613
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] | Purchased Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Purchased Impaired Loans - Outstanding Balance	264	295
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 Outstanding - Excluding Purchased Impaired Loans	2	1
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 Outstanding - Excluding Purchased Impaired Loans	5	5
LTV greater than or equal to 90% to less than 100% and updated FICO scores | Missing FICO | Home Equity [Member] | Purchased Impaired [Member] | 2nd Liens
Financing Receivable, Recorded Investment [Line Items]
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 Outstanding - Excluding Purchased Impaired Loans	25	23
LTV greater than or equal to 90% to less than 100% and updated FICO scores | Missing FICO | Residential Real Estate [Member] | Purchased Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Purchased Impaired Loans - Outstanding Balance	11	11
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 Outstanding - Excluding Purchased Impaired Loans	32	29
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] | Purchased Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Purchased Impaired Loans - Outstanding Balance	18	18
LTV less than 90% and updated FICO scores | FICO greater than 660 | Home Equity [Member] | 1st Liens
Financing Receivable, Recorded Investment [Line Items]
Loans Outstanding - Excluding Purchased Impaired Loans	12,360	10,736
LTV less than 90% and updated FICO scores | FICO greater than 660 | Home Equity [Member] | 2nd Liens
Financing Receivable, Recorded Investment [Line Items]
Loans Outstanding - Excluding Purchased Impaired Loans	7,151	7,255
LTV less than 90% and updated FICO scores | FICO greater than 660 | Home Equity [Member] | Purchased Impaired [Member] | 1st Liens
Financing Receivable, Recorded Investment [Line Items]
Purchased Impaired Loans - Outstanding Balance	92	86
LTV less than 90% and updated FICO scores | FICO greater than 660 | Home Equity [Member] | Purchased Impaired [Member] | 2nd Liens
Financing Receivable, Recorded Investment [Line Items]
Purchased Impaired Loans - Outstanding Balance	189	174
LTV less than 90% and updated FICO scores | FICO greater than 660 | Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Outstanding - Excluding Purchased Impaired Loans	4,994	4,701
LTV less than 90% and updated FICO scores | FICO greater than 660 | Residential Real Estate [Member] | Purchased Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Purchased Impaired Loans - Outstanding Balance	626	589
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 Outstanding - Excluding Purchased Impaired Loans	24,505	22,692
LTV less than 90% and updated FICO scores | FICO greater than 660 | Total home equity and residential real estate loans [Member] | Purchased Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Purchased Impaired Loans - Outstanding Balance	907	849
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 Outstanding - Excluding Purchased Impaired Loans	1,256	1,214
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 Outstanding - Excluding Purchased Impaired Loans	942	921
LTV less than 90% and updated FICO scores | FICO less than or equal to 660 | Home Equity [Member] | Purchased Impaired [Member] | 1st Liens
Financing Receivable, Recorded Investment [Line Items]
Purchased Impaired Loans - Outstanding Balance	135	142
LTV less than 90% and updated FICO scores | FICO less than or equal to 660 | Home Equity [Member] | Purchased Impaired [Member] | 2nd Liens
Financing Receivable, Recorded Investment [Line Items]
Purchased Impaired Loans - Outstanding Balance	169	163
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 Outstanding - Excluding Purchased Impaired Loans	637	621
LTV less than 90% and updated FICO scores | FICO less than or equal to 660 | Residential Real Estate [Member] | Purchased Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Purchased Impaired Loans - Outstanding Balance	599	598
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 Outstanding - Excluding Purchased Impaired Loans	2,835	2,756
LTV less than 90% and updated FICO scores | FICO less than or equal to 660 | Total home equity and residential real estate loans [Member] | Purchased Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Purchased Impaired Loans - Outstanding Balance	903	903
LTV less than 90% and updated FICO scores | Missing FICO | Home Equity [Member] | 1st Liens
Financing Receivable, Recorded Investment [Line Items]
Loans Outstanding - Excluding Purchased Impaired Loans	24	23
LTV less than 90% and updated FICO scores | Missing FICO | Home Equity [Member] | 2nd Liens
Financing Receivable, Recorded Investment [Line Items]
Loans Outstanding - Excluding Purchased Impaired Loans	14	13
LTV less than 90% and updated FICO scores | Missing FICO | Home Equity [Member] | Purchased Impaired [Member] | 1st Liens
Financing Receivable, Recorded Investment [Line Items]
Purchased Impaired Loans - Outstanding Balance	1	2
LTV less than 90% and updated FICO scores | Missing FICO | Home Equity [Member] | Purchased Impaired [Member] | 2nd Liens
Financing Receivable, Recorded Investment [Line Items]
Purchased Impaired Loans - Outstanding Balance	8	8
LTV less than 90% and updated FICO scores | Missing FICO | Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Outstanding - Excluding Purchased Impaired Loans	248	269
LTV less than 90% and updated FICO scores | Missing FICO | Residential Real Estate [Member] | Purchased Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Purchased Impaired Loans - Outstanding Balance	38	39
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 Outstanding - Excluding Purchased Impaired Loans	286	305
LTV less than 90% and updated FICO scores | Missing FICO | Total home equity and residential real estate loans [Member] | Purchased Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Purchased Impaired Loans - Outstanding Balance	47	49
Missing LTV and updated FICO scores | FICO greater than 660 | Home Equity [Member] | Purchased Impaired [Member] | 1st Liens
Financing Receivable, Recorded Investment [Line Items]
Purchased Impaired Loans - Outstanding Balance	2
Missing LTV and updated FICO scores | FICO greater than 660 | Residential Real Estate [Member] | Purchased Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Purchased Impaired Loans - Outstanding Balance	19	18
Missing LTV and updated FICO scores | FICO greater than 660 | Total home equity and residential real estate loans [Member] | Purchased Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Purchased Impaired Loans - Outstanding Balance	21	18
Missing LTV and updated FICO scores | FICO less than or equal to 660 | Home Equity [Member] | Purchased Impaired [Member] | 1st Liens
Financing Receivable, Recorded Investment [Line Items]
Purchased Impaired Loans - Outstanding Balance	1
Missing LTV and updated FICO scores | FICO less than or equal to 660 | Residential Real Estate [Member] | Purchased Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Purchased Impaired Loans - Outstanding Balance	17	7
Missing LTV and updated FICO scores | FICO less than or equal to 660 | Total home equity and residential real estate loans [Member] | Purchased Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Purchased Impaired Loans - Outstanding Balance	18	7
Missing LTV and updated FICO scores | Missing FICO | Home Equity [Member] | Purchased Impaired [Member] | 2nd Liens
Financing Receivable, Recorded Investment [Line Items]
Purchased Impaired Loans - Outstanding Balance	3
Missing LTV and updated FICO scores | Missing FICO | Residential Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Outstanding - Excluding Purchased Impaired Loans		42
Missing LTV and updated FICO scores | Missing FICO | Residential Real Estate [Member] | Purchased Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Purchased Impaired Loans - Outstanding Balance	7	9
Missing LTV and updated FICO scores | Missing FICO | Total home equity and residential real estate loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans Outstanding - Excluding Purchased Impaired Loans		42
Missing LTV and updated FICO scores | Missing FICO | Total home equity and residential real estate loans [Member] | Purchased Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Purchased Impaired Loans - Outstanding Balance	$ 10	$ 9