Guarantees - Additional Information (Detail) (USD $) Share data in Millions, unless otherwise specified	3 Months Ended	12 Months Ended				108 Months Ended		108 Months Ended	3 Months Ended	12 Months Ended			108 Months Ended							3 Months Ended					1 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2009	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2013 Ginnie Mae [Member]	Mar. 31, 2014 Non Government Sponsored Agency [Member]	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]	Mar. 31, 2014 US Government Sponsored Agency [Member]	Mar. 31, 2014 Standby Letters of Credit	Dec. 31, 2013 Standby Letters of Credit	Mar. 31, 2014 Mortgage Servicing Rights [Member]	Dec. 31, 2013 Mortgage Servicing Rights [Member]	Mar. 31, 2014 Visa Interest [Member]	Mar. 31, 2013 Visa Interest [Member]	May 31, 2009 Visa Interest [Member]	Mar. 31, 2014 Tax Credit Sales [Member]	Dec. 31, 2013 Tax Credit Sales [Member]	May 31, 2009 Not Designated as Hedging Instrument [Member] Derivative Financial Instruments, Liabilities [Member] Visa Interest [Member]	Dec. 31, 2013 Residential Mortgage, Loans Held For Sale [Member]	Dec. 31, 2013 Residential Mortgage, Loans Held For Sale [Member] Nonperforming Financing Receivable [Member]	Dec. 31, 2013 Loans Held For Investment [Member]	Mar. 31, 2014 Loans Held For Investment [Member] Nonperforming Financing Receivable [Member]	Dec. 31, 2013 Loans Held For Investment [Member] Nonperforming Financing Receivable [Member]
Maximum potential amount obligation																$ 3,300,000,000	$ 3,300,000,000						$ 19,000,000
Loans sold from January 1, 2005 to September 30, 2011						298,200,000,000		34,700,000,000					30,300,000,000	233,200,000,000
Loans Sold Repurchased Request Amount	70,000,000	1,500,000,000	1,700,000,000	1,700,000,000		8,500,000,000			1,000,000	18,000,000	22,000,000	50,000,000
Unpaid principal balance of loans related to unresolved requests previously received from investors	155,000,000	126,000,000				126,000,000			3,000,000	4,000,000			4,000,000	122,000,000	152,000,000
Mortgage Repurchase Reserve, Provision for Mortgage Loan Repurchase Losses	5,000,000
Reserve For Mortgage Loan Repurchase Losses	83,000,000	78,000,000	632,000,000			78,000,000	513,000,000
Repurchased or otherwise settled mortgages	8,000,000	249,000,000
Repurchased mortgage loans	334,000,000	339,000,000				339,000,000																				14,000,000	14,000,000	325,000,000	62,000,000	54,000,000
Loss Contingency Accrual, at Carrying Value																		27,000,000	21,000,000
Business Combination, Contingent Consideration, Liability	26,000,000	26,000,000				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																				1,000,000	1,000,000
Visa Share of Claims in Settlement Agreement Amount																				4,400,000,000
Tax Credits To Be Delivered																							$ 1,000,000	$ 1,000,000