Purchased Loans (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Financing Receivable, Impaired [Line Items]
Provision for credit losses (benefit)	$ 55,000,000	$ 137,000,000	$ 221,000,000	$ 530,000,000
Charge-offs			786,000,000	1,265,000,000
Specific allowance for loan and lease losses associated with purchased impaired loans	506,000,000		506,000,000		625,000,000
Purchased impaired loans	5,167,000,000	6,398,000,000	5,167,000,000	6,398,000,000	6,106,000,000
Purchased Impaired Loans [Member]
Financing Receivable, Impaired [Line Items]
Provision for credit losses (benefit)			(86,000,000)	59,000,000
Charge-offs			28,000,000	95,000,000
Specific allowance for loan and lease losses associated with purchased impaired loans	900,000,000		900,000,000		1,000,000,000
Purchased impaired loans	5,167,000,000		5,167,000,000		6,106,000,000
Impaired Loans With Associated Allowance [Member]
Financing Receivable, Impaired [Line Items]
Purchased impaired loans	4,700,000,000		4,700,000,000
Impaired Loans Without Associated Allowance [Member]
Financing Receivable, Impaired [Line Items]
Purchased impaired loans	$ 500,000,000		$ 500,000,000