Loans Loans - Schedule of Additional Information on Nonaccrual Loans (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Loans Receivable, Net [Abstract]
Interest income that would have been recorded if the nonaccrual receivable had been current in accordance with contractual terms during the period	$ 22	$ 30	$ 46	$ 61
Interest income that was recorded on nonaccrual loans and included in interest income during the period	$ 6	$ 8	$ 14	$ 11