CONSOLIDATED STATEMENT OF CHANGES IN SHAREHOLDERS' EQUITY (USD $) In Millions, except Share data, unless otherwise specified	Total	Preferred Stock	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Balance at beginning of period at Dec. 31, 2009 (Scenario, Previously Reported [Member])					$ 45	$ (228)
Adjustment to initially apply new guidance for consolidation of VIEs, net of tax (Restatement Adjustment [Member])					1	(246)
Balance at beginning of period at Dec. 31, 2009				13,795	46	(474)
Number of shares at beginning of period at Dec. 31, 2009			712
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Capital contributions from parent				0
Return of capital on preferred shares issued to CT Financial Services, Inc.				(3)
Employee benefit plans and other				(7)
Net income (loss)	1,564				1,564
Cash dividends declared on preferred stock					(74)
Other comprehensive income, net of tax	321					321
Common shareholders' equity	15,168
Number of shares of common stock issued to parent			0
Balance at end of period at Dec. 31, 2010	16,733	1,565	0	13,785	1,536	(153)
Number of shares at end of period at Dec. 31, 2010		25,947,500	712
Adjustment to initially apply new guidance for consolidation of VIEs, net of tax at Dec. 31, 2010					0	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Capital contributions from parent				21
Return of capital on preferred shares issued to CT Financial Services, Inc.				0
Employee benefit plans and other				8
Net income (loss)	1,018				1,018
Cash dividends declared on preferred stock					(73)
Other comprehensive income, net of tax	795					795
Common shareholders' equity	16,937
Number of shares of common stock issued to parent			0
Balance at end of period at Dec. 31, 2011	18,502	1,565	0	13,814	2,481	642
Number of shares at end of period at Dec. 31, 2011		25,947,500	712
Adjustment to initially apply new guidance for consolidation of VIEs, net of tax at Dec. 31, 2011					0	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Capital contributions from parent				312
Return of capital on preferred shares issued to CT Financial Services, Inc.				0
Employee benefit plans and other				(3)
Net income (loss)	(1,045)				(1,045)
Cash dividends declared on preferred stock					(73)
Other comprehensive income, net of tax	143					143
Common shareholders' equity	16,271
Number of shares of common stock issued to parent			1
Balance at end of period at Dec. 31, 2012	$ 17,836	$ 1,565	$ 0	$ 14,123	$ 1,363	$ 785
Number of shares at end of period at Dec. 31, 2012		25,947,500	713