CONSOLIDATED STATEMENT OF CHANGES IN SHAREHOLDERS' EQUITY (UNAUDITED) (USD $) In Millions, unless otherwise specified	Total	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]
Balance at beginning of period at Dec. 31, 2012		$ 1,565
Balance at beginning of period at Dec. 31, 2012			0	14,123	1,363	785
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other				(33)
Net income	363
Cash dividends declared on preferred stock					(36)
Adjustment to add other-than-temporary impairment on securities held-to-maturity due to the consolidation of a variable interest entity	0					67
Other comprehensive income (loss), net of tax	(661)					(661)
Balance at end of period at Jun. 30, 2013	17,402	1,565
Balance at end of period at Jun. 30, 2013	15,837		0	14,090	1,690	57
Balance at beginning of period at Dec. 31, 2013	16,464	1,565
Balance at beginning of period at Dec. 31, 2013	14,899		0	14,106	952	(159)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other				0
Net income	283
Cash dividends declared on preferred stock					(36)
Adjustment to add other-than-temporary impairment on securities held-to-maturity due to the consolidation of a variable interest entity	(3)					0
Other comprehensive income (loss), net of tax	273					273
Balance at end of period at Jun. 30, 2014	16,984	1,565
Balance at end of period at Jun. 30, 2014	$ 15,419		$ 0	$ 14,106	$ 1,199	$ 114