Funded Status of Plans (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Pension Plans, Defined Benefit
Fair value of plan assets	$ 2,742		$ 2,550		$ 2,522
Benefit obligations	(2,838)	[1]	(2,661)	[1]	(2,261)
Funded status	(96)		(111)
Other Postretirement Benefit Plans, Defined Benefit
Fair value of plan assets	164	[2]	161	[3]	165
Benefit obligations	(167)	[1]	(173)	[1]	(189)
Funded status	$ (3)		$ (12)

[1] 1Includes $91 million and $107 million of benefit obligations for the unfunded nonqualified supplemental pension plans as of December 31, 2012 and 2011, respectively.

[2] Schedule does not include accrued income. Fair ValueMeasurements as ofDecember 31, 2011 1(Dollars in millions)Assets Measuredat Fair Value asof December 31,2011 Quoted Prices InActive Marketsfor IdenticalAssets (Level 1) SignificantOtherObservableInputs(Level 2) SignificantUnobservableInputs(Level 3)Mutual funds: Large cap fund $37 $37 $— $—Investment grade tax-exempt bond 25 25 — —International fund 6 6 — —Common and collective funds: SunTrust Reserve Fund 1 — 1 —SunTrust Equity Fund 37 — 37 —SunTrust Georgia Tax-Free Fund 26 — 26 —SunTrust National Tax-Free Fund 17 — 17 —SunTrust Aggregate Fixed Income Fund 7 — 7 —SunTrust Short-Term Bond Fund 5 — 5 —Total plan assets $161 $68 $93 $—

[3] Schedule does not include accrued income.