Loans and Allowance for Loan Losses (Details 8) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Financing receivable recorded investment accrual and nonaccrual status
Nonaccrual	$ 553	$ 638
Total consumer portfolio	24,333	23,355
Residential Mortgage [Member]
Financing receivable recorded investment accrual and nonaccrual status
Accrual	20,436	19,340
Nonaccrual	293	285
Total consumer portfolio	20,729	19,625
Home Equity and Other Consumer Loans [Member]
Financing receivable recorded investment accrual and nonaccrual status
Accrual	3,560	3,706
Nonaccrual	44	24
Total consumer portfolio	3,604	3,730
Consumer [Member]
Financing receivable recorded investment accrual and nonaccrual status
Accrual	23,996	23,046
Nonaccrual	337	309
Total consumer portfolio	$ 24,333	$ 23,355