Goodwill and Other Intangible Assets - Mortgage Fees and Related Income (Details 4) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Schedule Of Mortgage Fees And Related Income [Line Items]
Servicing Asset at Fair Value, Period Increase (Decrease)		$ (6,400,000,000)
Risk management:
All other	7,000,000	7,000,000	15,000,000
Mortgage fees and related income	8,687,000,000	2,721,000,000	3,870,000,000
Consumer & Community Banking [Member]
Net production revenue:
Production revenue	5,783,000,000	3,395,000,000	3,440,000,000
Repurchase losses	(272,000,000)	(1,347,000,000)	(2,912,000,000)
Net production revenue	5,511,000,000	2,048,000,000	528,000,000
Operating revenue:
Loan servicing revenue	3,772,000,000	4,134,000,000	4,575,000,000
Changes in MSR asset fair value due to modeled amortization	(1,222,000,000)	(1,904,000,000)	(2,384,000,000)
Total operating revenue	2,550,000,000	2,230,000,000	2,191,000,000
Risk management:
Changes in MSR asset fair value due to market interest rates	(587,000,000)	(5,390,000,000)	(2,224,000,000)
Other changes in MSR asset fair value due to inputs or assumptions in model	(46,000,000)	(1,727,000,000)	(44,000,000)
Derivative valuation adjustments and other	1,252,000,000	5,553,000,000	3,404,000,000
Total risk management	619,000,000	(1,564,000,000)	1,136,000,000
Total CCB net mortgage servicing revenue	$ 3,169,000,000	$ 666,000,000	$ 3,327,000,000