Reinsurance Arrangements and Guarantees - Additional Information (Detail) (USD $) Share data in Millions, unless otherwise specified	3 Months Ended	12 Months Ended				108 Months Ended		108 Months Ended	12 Months Ended			108 Months Ended							12 Months Ended						1 Months Ended
	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2009	Dec. 31, 2013	Dec. 31, 2010	Dec. 31, 2013 Ginnie Mae	Dec. 31, 2013 Non Government Sponsored Agency [Member]	Dec. 31, 2012 Non Government Sponsored Agency [Member]	Dec. 31, 2011 Non Government Sponsored Agency [Member]	Dec. 31, 2013 Non Government Sponsored Agency [Member]	Dec. 31, 2013 US Government Sponsored Agency [Member]	Dec. 31, 2012 US Government Sponsored Agency [Member]	Dec. 31, 2013 Standby Letters of Credit	Dec. 31, 2012 Standby Letters of Credit	Dec. 31, 2013 Mortgage Servicing Rights [Member]	Dec. 31, 2012 Mortgage Servicing Rights [Member]	Dec. 31, 2013 Visa Interest [Member]	Dec. 31, 2012 Visa Interest [Member]	Dec. 31, 2011 Visa Interest [Member]	May 31, 2009 Visa Interest [Member]	Dec. 31, 2013 Tax Credit Sales [Member]	Dec. 31, 2012 Tax Credit Sales [Member]	May 31, 2009 Not Designated as Hedging Instrument [Member] Derivative Financial Instruments, Liabilities [Member] Visa Interest [Member]	Dec. 31, 2013 Loans Held For Investment [Member]	Dec. 31, 2012 Loans Held For Investment [Member]	Dec. 31, 2013 Loans Held For Investment [Member] Nonperforming Financing Receivable [Member]	Dec. 31, 2012 Loans Held For Investment [Member] Nonperforming Financing Receivable [Member]	Dec. 31, 2013 Residential Mortgage, Loans Held For Sale [Member]	Dec. 31, 2012 Residential Mortgage, Loans Held For Sale [Member]	Dec. 31, 2013 Residential Mortgage, Loans Held For Sale [Member] Nonperforming Financing Receivable [Member]	Dec. 31, 2012 Residential Mortgage, Loans Held For Sale [Member] Nonperforming Financing Receivable [Member]
Maximum potential amount obligation															$ 3,300,000,000	$ 4,000,000,000							$ 37,000,000
Loans sold from January 1, 2005 to September 30, 2011						295,600,000,000		34,400,000,000				30,300,000,000	230,900,000,000
Loans Sold Repurchased Request Amount		1,500,000,000	1,700,000,000	1,700,000,000		8,500,000,000			18,000,000	22,000,000	50,000,000
Unpaid principal balance of loans related to unresolved requests previously received from investors	126,000,000	126,000,000	655,000,000			126,000,000			4,000,000	16,000,000		4,000,000	122,000,000	639,000,000
Mortgage Repurchase Reserve, Provision for Mortgage Loan Repurchase Losses	63,000,000
Reserve For Mortgage Loan Repurchase Losses	78,000,000	78,000,000	632,000,000	320,000,000		78,000,000	265,000,000
Repurchased or otherwise settled mortgages		1,100,000,000	769,000,000
Repurchased mortgage loans	339,000,000	339,000,000	240,000,000			339,000,000																				325,000,000	209,000,000	54,000,000	70,000,000	14,000,000	31,000,000	14,000,000	31,000,000
Loss Contingency Accrual, at Carrying Value																	21,000,000	12,000,000
Business Combination, Contingent Consideration, Liability	26,000,000	26,000,000	30,000,000			26,000,000
Third Party Escrow, Gross Funded Since Inception																			8,500,000,000
Third Party Escrow, Amount Paid From Escrow																			4,100,000,000
Third Party litigation claims paid from escrow																			4,400,000,000
Number Of Shares Sold To Selected Financial Institutions																									3.2
Shares of Class B Visa Inc Common Stock Sold to Another FinancialIinstitution, Value					112,000,000
Gain (Loss) on Sale of Other Investments					112,000,000
Common stock conversion rate																			0.4206			0.6296
Payments to derivative counterparty																			0	26,000,000	8,000,000
Visa Share of Claims in Settlement Agreement Amount																			4,400,000,000
Tax Credits To Be Delivered																							$ 1,000,000	$ 3,000,000