CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (UNAUDITED) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 104	$ 183
Net change in unrealized gains (losses), net of tax:
Securities available-for-sale	130	(150)
Other-than-temporarily impaired debt securities held-to-maturity	1	0
Derivatives designated as cash flow hedges	(20)	23
Total other comprehensive income (loss)	111	(127)
Comprehensive income	$ 215	$ 56