CONSOLIDATED STATEMENT OF CHANGES IN SHAREHOLDERS' EQUITY (UNAUDITED) (USD $) In Millions, except Share data, unless otherwise specified	Total	Preferred Stock	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income
Balance at end of period at Dec. 31, 2010		$ 1,565
Number of shares at end of period at Dec. 31, 2010		25,947,500,000,000	712
Balance at beginning of period at Dec. 31, 2010			0	13,785	1,536	(153)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Capital contributions from parent				21
Employee benefit plans and other				8
Net income (loss)	1,018				1,018
Cash dividends declared on preferred stock					(73)
Other-than-temporary impairment on securities held-to-maturity due to the consolidation of a variable interest entity	11					0
Other comprehensive income (loss), net of tax	795					795
Number of shares at beginning of period		25,947,500	712
Number of shares of common stock issued to parent			0
Balance at beginning of period at Dec. 31, 2011	18,502	1,565
Balance at end of period at Dec. 31, 2011	16,937		0	13,814	2,481	642
Number of shares at end of period at Dec. 31, 2011		25,947,500	712
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Capital contributions from parent				312
Employee benefit plans and other				(3)
Net income (loss)	(1,045)
Cash dividends declared on preferred stock					(73)
Other-than-temporary impairment on securities held-to-maturity due to the consolidation of a variable interest entity	0					0
Other comprehensive income (loss), net of tax	143					143
Number of shares at beginning of period		25,947,500	713
Number of shares of common stock issued to parent			1
Balance at beginning of period at Dec. 31, 2012	17,836	1,565
Balance at end of period at Dec. 31, 2012	16,271		0	14,123	1,363	785
Balance at end of period at Sep. 30, 2012
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	47
Number of shares at beginning of period		25,947,500
Balance at beginning of period at Dec. 31, 2012	17,836	1,565
Balance at end of period at Dec. 31, 2012	16,271		0	14,123	1,363	785
Number of shares at end of period at Dec. 31, 2012		25,947,500	713
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Capital contributions from parent				0
Employee benefit plans and other				(17)
Net income (loss)	(338)
Cash dividends declared on preferred stock					(73)
Other-than-temporary impairment on securities held-to-maturity due to the consolidation of a variable interest entity						(67)
Other comprehensive income (loss), net of tax	(877)					(877)
Number of shares at beginning of period		25,947,500	713
Number of shares of common stock issued to parent			0
Balance at beginning of period at Dec. 31, 2013	16,464	1,565
Balance at end of period at Dec. 31, 2013	14,899		0	14,106	952	(159)
Balance at end of period at Sep. 30, 2013
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(705)
Number of shares at beginning of period		25,947,500
Balance at beginning of period at Dec. 31, 2013	16,464	1,565
Balance at end of period at Dec. 31, 2013	$ 14,899