Capital - Additional Information (Details) (USD $)	3 Months Ended		12 Months Ended				3 Months Ended	12 Months Ended						12 Months Ended			12 Months Ended									12 Months Ended				12 Months Ended		12 Months Ended
	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011	Mar. 31, 2014 Common Stock [Member]	Dec. 31, 2013 Common Stock [Member]	Dec. 31, 2013 Series A Preferred Stock [Member]	Dec. 31, 2012 Series A Preferred Stock [Member]	Dec. 31, 2011 Series A Preferred Stock [Member]	Dec. 31, 2009 Series A Preferred Stock [Member]	Sep. 30, 2006 Series A Preferred Stock [Member]	Dec. 31, 2013 Series B Preferred Stock [Member]	Dec. 31, 2012 Series B Preferred Stock [Member]	Dec. 31, 2011 Series B Preferred Stock [Member]	Dec. 31, 2011 Series C and Series D Preferred Stock [Member]	Dec. 31, 2013 Series E Preferred Stock [Member]	Dec. 31, 2012 Series E Preferred Stock [Member]	Dec. 31, 2013 Retained Earnings [Member]		Dec. 31, 2012 Retained Earnings [Member]	Dec. 31, 2011 Retained Earnings [Member]	Dec. 31, 2013 Sun Trust Bank [Member]	Dec. 31, 2012 Sun Trust Bank [Member]	Dec. 31, 2013 Parent Company [Member]	Dec. 31, 2012 Parent Company [Member]	Dec. 31, 2011 Parent Company [Member]	Sep. 22, 2011 Group 1 [Member]	Dec. 31, 2011 Group 2 [Member]	Sep. 22, 2011 Group 2 [Member]	Dec. 31, 2011 Group 2 [Member] Additional Paid-in Capital [Member]	Sep. 22, 2011 Warrant [Member]	Oct. 11, 2013 Minimum [Member]
Schedule of Capitalization, Equity [Line Items]
Common Stock, Dividends, Per Share, Declared	$ 0.10	$ 0.05	$ 0.35		$ 0.20	$ 0.12
Stock Repurchased During Period, Value							$ 50,000,000	$ 150,000,000
Stock Repurchased During Period, Shares								4,600,000
Dividend Per Quarter Threshold Prior To Tenth Anniversay Triggering Execise Of Warrants			$ 0.54
Dividends, Common Stock, Cash			(188,000,000)		(107,000,000)	(64,000,000)														(188,000,000)		(107,000,000)	(64,000,000)
Common Stock, Dividends, Per Share, Cash Paid			$ 0.35		$ 0.20	$ 0.12
Dividends, Preferred Stock, Cash			(37,000,000)	[1]	(12,000,000)	(7,000,000)														(37,000,000)	[1]	(12,000,000)	(7,000,000)			(37,000,000)	(12,000,000)	(7,000,000)
Dividends, Preferred Stock						67,000,000
Preferred Stock, Dividends, Per Share, Cash Paid									$ 4,056	$ 4,052	$ 4,056			$ 4,056	$ 4,052		$ 1,236	$ 5,793	$ 0
Retained Earnings, Unappropriated																								2,600,000,000	1,800,000,000
Cash Reserve Deposit Required and Made			2,000,000,000		1,900,000,000
Tier One Common Capital to Risk Weighted Assets			9.82%		10.04%																													4.50%
Tier One Risk Based Capital to Risk Weighted Assets			10.81%		11.13%																			10.96%	11.38%									6.00%
Capital to Risk Weighted Assets			12.81%		13.48%																			12.84%	13.59%									8.00%
Tier One Leverage Capital to Average Assets			9.58%		8.91%																			9.78%	9.23%									4.00%
Capital Required for Capital Adequacy to Risk Weighted Assets																																		2.50%
Tier One Risk Based Capital			16,073,000,000		14,975,000,000																			16,059,000,000	15,121,000,000
Preferred Stock, Shares Authorized			50,000,000		50,000,000								5,000			5,010			5,000
Preferred Stock, Shares Issued													5,000			1,025			4,500
Preferred Stock, No Par Value													$ 0			$ 0			$ 0
Preferred Stock, Liquidation Preference Per Share													$ 100,000			$ 100,000			$ 100,000
Preferred stock dividends, variable rate basis, three month LIBOR									three-month LIBOR					three-month LIBOR
Declared And Accrued Preferred Stock Dividend Basis Spread on Variable Rate									0.53%					0.65%
Declared And Accrued Preferred Stock Dividend Fixed Rate									4.00%					4.00%					5.875%
Stock Redeemed or Called During Period, Shares												3,275
Preferred Stock, Redemption Price Per Share													$ 100,000			$ 100,000			$ 100,000
Class of Warrant or Right, Outstanding																																	17,900,000
Class of Warrant or Right, Number of Securities Called by Warrants or Rights																													11,900,000		6,000,000
Class of Warrant or Right, Exercise Price of Warrants or Rights																													44.15		33.70
warrants purchased																														4,000,000
Payments for Repurchase of Warrants			$ 0		$ 0	$ 11,000,000																				$ 0	$ 0	$ 11,000,000				$ 11,000,000

[1] Dividends were $4,056 per share for Perpetual Preferred Stock Series A and B and $5,793 per share for Perpetual Preferred Stock Series E for the year ended December 31, 2013.