CONSOLIDATED STATEMENT OF CHANGES IN SHAREHOLDERS' EQUITY (UNAUDITED) (USD $) In Millions, unless otherwise specified	Total	Preferred Stock	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income
Balance at start 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				(36)
Net income	183
Cash dividends declared on preferred stock					(18)
Other comprehensive income (loss), net of tax	(127)					(127)
Balance at end of period at Mar. 31, 2013	17,838	1,565
Balance at end of period at Mar. 31, 2013	16,273		0	14,087	1,528	658
Balance at start of period at Dec. 31, 2013	16,464
Balance at beginning of period at Dec. 31, 2013	14,899			14,106	952	(159)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other				6
Net income	104
Cash dividends declared on preferred stock					(18)
Other comprehensive income (loss), net of tax	111					111
Balance at end of period at Mar. 31, 2014	16,667	1,565
Balance at end of period at Mar. 31, 2014	$ 15,102		$ 0	$ 14,112	$ 1,038	$ (48)