Fair Value Measurement and Election - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended			3 Months Ended		6 Months Ended				3 Months Ended		6 Months Ended			6 Months Ended									3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended						6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011	Jun. 30, 2012 Fair Value, Inputs, Level 2 [Member] Property Subject to Operating Lease [Member]	Jun. 30, 2011 Fair Value, Inputs, Level 2 [Member] Property Subject to Operating Lease [Member]	Jun. 30, 2012 Fair Value, Inputs, Level 2 [Member] Property Subject to Operating Lease [Member]	Jun. 30, 2011 Fair Value, Inputs, Level 2 [Member] Property Subject to Operating Lease [Member]	Jun. 30, 2012 Total Return Swap Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2011 Total Return Swap Fair Value, Inputs, Level 2 [Member]	Jun. 30, 2012 Interest Rate Lock Commitments	Jun. 30, 2011 Interest Rate Lock Commitments	Jun. 30, 2012 Interest Rate Lock Commitments	Jun. 30, 2011 Interest Rate Lock Commitments	Jun. 30, 2012 Collateralized Debt Obligations [Member] Fair Value, Inputs, Level 2 [Member]	Jun. 30, 2012 Lower Limit years	Jun. 30, 2012 Upper Limit years	Jun. 30, 2012 Asset-backed Securities [Member] Trading Assets [Member] Fair Value, Inputs, Level 2 [Member]	Jun. 30, 2012 Asset-backed Securities [Member] Available-for-sale Securities [Member] Fair Value, Inputs, Level 2 [Member]	Jun. 30, 2012 Asset-backed Securities [Member] Student Loans	Jun. 30, 2012 Equity Securities, Coca Cola Fair Value, Inputs, Level 3 [Member]	Dec. 31, 2011 Equity Securities, Coca Cola Fair Value, Inputs, Level 3 [Member]	Jun. 30, 2012 Trading Account Assets Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2011 Trading Account Assets Fair Value, Inputs, Level 2 [Member]	Jun. 30, 2012 Residential Mortgage, Loans Held For Sale [Member] Fair Value, Inputs, Level 2 [Member]	Jun. 30, 2011 Residential Mortgage, Loans Held For Sale [Member] Fair Value, Inputs, Level 2 [Member]	Jun. 30, 2012 Residential Mortgage, Loans Held For Sale [Member] Fair Value, Inputs, Level 2 [Member]	Jun. 30, 2011 Residential Mortgage, Loans Held For Sale [Member] Fair Value, Inputs, Level 2 [Member]	Jun. 30, 2012 Residential Mortgage, Loans Held For Sale [Member] Nonperforming Financing Receivable [Member]	Dec. 31, 2011 Residential Mortgage, Loans Held For Sale [Member] Nonperforming Financing Receivable [Member]	Jun. 30, 2012 Residential Mortgage, Loans Held For Sale [Member] Nonperforming Financing Receivable [Member]	Jun. 30, 2011 Residential Mortgage, Loans Held For Sale [Member] Nonperforming Financing Receivable [Member]	Jun. 30, 2012 Brokered Deposits Fair Value, Inputs, Level 2 [Member]	Jun. 30, 2011 Brokered Deposits Fair Value, Inputs, Level 2 [Member]	Jun. 30, 2012 Brokered Deposits Fair Value, Inputs, Level 2 [Member]	Jun. 30, 2011 Brokered Deposits Fair Value, Inputs, Level 2 [Member]	Jun. 30, 2012 Long-term Debt [Member] Fair Value, Inputs, Level 2 [Member]	Jun. 30, 2011 Long-term Debt [Member] Fair Value, Inputs, Level 2 [Member]	Jun. 30, 2012 Long-term Debt [Member] Fair Value, Inputs, Level 2 [Member]	Jun. 30, 2011 Long-term Debt [Member] Fair Value, Inputs, Level 2 [Member]	Jun. 30, 2012 Repossessed Personal Property [Member] Other Assets [Member] Fair Value, Inputs, Level 2 [Member]	Jun. 30, 2011 Repossessed Personal Property [Member] Other Assets [Member] Fair Value, Inputs, Level 2 [Member]	Jun. 30, 2012 Repossessed Personal Property [Member] Other Assets [Member] Fair Value, Inputs, Level 2 [Member]	Jun. 30, 2011 Repossessed Personal Property [Member] Other Assets [Member] Fair Value, Inputs, Level 2 [Member]	Jun. 30, 2012 Fair Value, Measurements, Recurring [Member]	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member]	Jun. 30, 2012 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 3 [Member]	Dec. 31, 2011 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 3 [Member]	Jun. 30, 2012 Fair Value, Measurements, Recurring [Member] Other real estate owned residential properties [Member] Fair Value, Inputs, Level 3 [Member] Lower Limit	Jun. 30, 2012 Fair Value, Measurements, Recurring [Member] Other real estate owned residential properties [Member] Fair Value, Inputs, Level 3 [Member] Upper Limit	Jun. 30, 2012 Fair Value, Measurements, Recurring [Member] Other real estate owned residential properties [Member] Fair Value, Inputs, Level 3 [Member] Weighted Average [Member]	Jun. 30, 2012 Fair Value, Measurements, Recurring [Member] Other real estate owned commercial properties [Member] Fair Value, Inputs, Level 3 [Member] Lower Limit	Jun. 30, 2012 Fair Value, Measurements, Recurring [Member] Other real estate owned commercial properties [Member] Fair Value, Inputs, Level 3 [Member] Upper Limit	Jun. 30, 2012 Fair Value, Measurements, Recurring [Member] Other real estate owned commercial properties [Member] Fair Value, Inputs, Level 3 [Member] Weighted Average [Member]
Transferred Out of Level 3 in The Fair Value Hierarchy												$ (218,000,000)	$ (40,000,000)	$ (390,000,000)	$ (54,000,000)
Government guaranteed percent																					97.00%
Probable forecasted sale of Coke																	6.5	7.0
Derivative in a liability position, fair value																						349,000,000	189,000,000
LHFI at fair value	406,000,000		406,000,000		433,000,000					1,900,000,000	1,700,000,000
Trading loans were outstanding																								235,000,000	323,000,000
Recognized losses due to changes in fair value attributable to borrower-specific credit risk																										5,000,000	(4,000,000)	2,000,000	(9,000,000)
Loans held for investment																																														406,000,000	433,000,000	406,000,000	433,000,000
Recognized gains (losses) on liabilities due to changes in its own credit spread																																		(1,000,000)	1,000,000	(6,000,000)	(13,000,000)	1,000,000	5,000,000	(8,000,000)	(15,000,000)
Issued securities contained in a consolidated CLO at fair value in order to recognize the nonrecourse nature of these liabilities																288,000,000																														2,010,000,000	1,997,000,000	0	0
Transferred loans that were previously designated as held for investment to held for sale																																116,000,000	47,000,000
Incremental charge-off	397,000,000	563,000,000	860,000,000	1,178,000,000																												35,000,000	10,000,000
Loans sold at carrying value	454,000,000	277,000,000	454,000,000	277,000,000																										71,000,000	34,000,000	71,000,000
Gain (Loss) on Sale of Mortgage Loans																																4,000,000
Loans transferred from loans held for sale to loans			31,000,000	46,000,000																										7,000,000	13,000,000
Fair Value Inputs, Discount Rate, Variable Spread																																																		15.00%	50.00%	30.00%	5.00%	30.00%	24.00%
Asset Impairment Charges						0	0	1,000,000	1,000,000																																	0	1,000,000	1,000,000	1,000,000
Fair value measurement with unobservable inputs reconciliation recurring basis asset and liabilities level 3 transfers out of																			$ 32,000,000	$ 71,000,000