Goodwill and Intangible Assets Goodwill and Intangible Assets (Schedule of Core Deposit Intangible Estimated Future Amortization Expense (Details) (Core deposit intangible, USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Core deposit intangible
Acquired Finite-Lived Intangible Assets [Line Items]
2014	$ 3
2015	3
2016	2
2017	2
2018	2
Thereafter	4
Total	$ 16	$ 20

Goodwill and Intangible Assets Goodwill and Intangible Assets (Schedule of Core Deposit Intangible Estimated Future Amortization Expense (Details) (Core deposit intangible, USD $)
In Millions, unless otherwise specified

Dec. 31, 2013

Dec. 31, 2012

Core deposit intangible

Acquired Finite-Lived Intangible Assets [Line Items]

$ 3

$ 16

$ 20