Goodwill and Other Intangible Assets (Identifiable Intangible Assets) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Acquired Finite Lived Intangible Assets [Line Items]
Gross carrying amount	$ 1,754	$ 1,752
Accumulated amortization	(1,185)	(1,079)
Net carrying amount	569	673
Core Deposit Intangibles [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Weighted-average remaining life	7 years 1 month
Gross carrying amount	672	672
Accumulated amortization	(555)	(522)
Net carrying amount	117	150
Other Identifiable Intangible Assets [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Weighted-average remaining life	15 years 3 months
Gross carrying amount	1,082	1,080
Accumulated amortization	(630)	(557)
Net carrying amount	$ 452	$ 523