Fair Value Measurement and Fair Value of Financial Instruments (Details 6) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Loans:
Impaired loans	$ 620		$ 620		$ 608
Loss Impaired loans	(6)	(11)	(35)	(23)
Other assets:
Loss on OREO	(1)	(3)	(3)	(6)
Loss, Total	(7)	(14)	(38)	(29)
Fair Value Measurements, Nonrecurring
Loans:
Impaired loans	198	91	198	91
Other assets:
OREO	14	37	14	37
Total	212	128	212	128
Fair Value Measurements, Nonrecurring | Level 3
Loans:
Impaired loans	198	91	198	91
Other assets:
OREO	14	37	14	37
Total	$ 212	$ 128	$ 212	$ 128