CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (UNAUDITED) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 179	$ 180	$ 283	$ 363
Net change in unrealized gains (losses), net of tax:
Securities available-for-sale	175	(585)	305	(735)
Other-than-temporarily impaired debt securities held-to-maturity	2	0	3	0
Derivatives designated as cash flow hedges	(15)	51	(35)	74
Total other comprehensive income (loss)	162	(534)	273	(661)
Comprehensive income (loss)	$ 341	$ (354)	$ 556	$ (298)