Loans (Details 16) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Consumer loan portfolio
Nonaccrual Loans	$ 1,645	$ 1,828
Accruing Loans Contractually Past Due 90 days or More	46	61
Total	18,647	18,218
Home equity mortgages [Member]
Consumer loan portfolio
Total	2,455	2,563
Credit card receivables [Member]
Consumer loan portfolio
Total	783	828
Other consumer [Member]
Consumer loan portfolio
Total	651	714
Consumer Loan [Member]
Consumer loan portfolio
Performing Loans	17,678	17,259
Nonaccrual Loans	926	912
Accruing Loans Contractually Past Due 90 days or More	43	47
Total	18,647	18,218
Consumer Loan [Member] | Residential mortgages, excluding home equity mortgages [Member]
Consumer loan portfolio
Performing Loans	13,914	13,298
Nonaccrual Loans	844	815
Total	14,758	14,113
Consumer Loan [Member] | Home equity mortgages [Member]
Consumer loan portfolio
Performing Loans	2,378	2,474
Nonaccrual Loans	77	89
Total	2,455	2,563
Consumer Loan [Member] | Total residential mortgages [Member]
Consumer loan portfolio
Performing Loans	16,292	15,772
Nonaccrual Loans	921	904
Total	17,213	16,676
Consumer Loan [Member] | Credit card receivables [Member]
Consumer loan portfolio
Performing Loans	766	808
Accruing Loans Contractually Past Due 90 days or More	17	20
Total	783	828
Consumer Loan [Member] | Other consumer [Member]
Consumer loan portfolio
Performing Loans	620	679
Nonaccrual Loans	5	8
Accruing Loans Contractually Past Due 90 days or More	26	27
Total	$ 651	$ 714