Purchased Loans (Narrative) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Financing Receivable, Impaired [Line Items]
Provision for credit losses (benefit)	$ 46,000,000	$ 72,000,000	$ 100,000,000	$ 166,000,000
Charge-offs			392,000,000	564,000,000
Specific allowance for loan and lease losses associated with purchased impaired loans	374,000,000		374,000,000		$ 463,000,000
Purchased impaired loans	4,465,000,000	$ 5,557,000,000	4,465,000,000	5,557,000,000	4,858,000,000
Purchased Impaired Loans [Member]
Financing Receivable, Impaired [Line Items]
Provision for credit losses (benefit)			(12,000,000)	(95,000,000)
Charge-offs			5,000,000	$ 24,000,000
Net carrying value of the net accumulation of realized gains and losses on pooled loan recorded investments	0		0
Impaired Loans With Associated Allowance [Member] | Purchased Impaired Loans [Member]
Financing Receivable, Impaired [Line Items]
Specific allowance for loan and lease losses associated with purchased impaired loans	$ 900,000,000		$ 900,000,000		$ 900,000,000