Reinsurance Arrangements and Guarantees - Additional Information (Detail) (USD $) Share data in Millions, unless otherwise specified	6 Months Ended	12 Months Ended			76 Months Ended		3 Months Ended		6 Months Ended									6 Months Ended					1 Months Ended	6 Months Ended	12 Months Ended		6 Months Ended	12 Months Ended								6 Months Ended
	Jun. 30, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008	Jun. 30, 2011	Jun. 30, 2011 Upper Limit Mortgage Reinsurance Contracts	Jun. 30, 2011 Mortgage Reinsurance Contracts	Jun. 30, 2010 Mortgage Reinsurance Contracts	Jun. 30, 2011 Mortgage Reinsurance Contracts	Jun. 30, 2010 Mortgage Reinsurance Contracts	Dec. 31, 2010 Mortgage Reinsurance Contracts	Jun. 30, 2011 Standby Letters of Credit	Dec. 31, 2010 Standby Letters of Credit	Jun. 30, 2011 Mortgage Loans and Mortgage Servicing Rights	Dec. 31, 2010 Mortgage Loans and Mortgage Servicing Rights	Jun. 30, 2011 Mortgage Loans and Mortgage Servicing Rights Sales	Dec. 31, 2010 Mortgage Loans and Mortgage Servicing Rights Sales	Jun. 30, 2011 Mortgage Loans and Mortgage Servicing Rights, Repurchase Reserves	Jun. 30, 2010 Mortgage Loans and Mortgage Servicing Rights, Repurchase Reserves	Dec. 31, 2010 Mortgage Loans and Mortgage Servicing Rights, Repurchase Reserves	Jun. 30, 2011 Mortgage Loans and Mortgage Servicing Rights, Repurchase Reserves Non Performing Loans	Dec. 31, 2010 Mortgage Loans and Mortgage Servicing Rights, Repurchase Reserves Non Performing Loans	May 31, 2009 Visa Interest	Jun. 30, 2011 Visa Interest	Dec. 31, 2010 Visa Interest	Dec. 31, 2009 Visa Interest	Jun. 30, 2011 Non-Agency Securities	Dec. 31, 2010 Non-Agency Securities	Dec. 31, 2009 Non-Agency Securities	Dec. 31, 2008 Non-Agency Securities	Jun. 30, 2011 Agency Securities	Dec. 31, 2010 Agency Securities	Jun. 30, 2011 Ginnie Mae	Jun. 30, 2011 Contingent Consideration	Dec. 31, 2010 Contingent Consideration	Jun. 30, 2011 Upper Limit Year	Jun. 30, 2011 Lower Limit Year
Mortgage loans were covered by such mortgage reinsurance contracts							$ 8,500,000,000		$ 8,500,000,000
Total loss exposure ceded to the Company							333,000,000		333,000,000
Maximum amount of loss exposure based on funds held in each separate trust account, including net premiums due to the trust accounts							69,000,000		69,000,000
Maximum amount of loss exposure based on funds held in each separate trust account, reserved for reducing the Company's net remaining loss exposure							60,000,000		60,000,000		148,000,000
Net remaining loss exposure							9,000,000		9,000,000
Future reported losses						9,000,000
Future cash losses						9,000,000
Premium income, mortgage reinsurance							6,000,000	10,000,000	14,000,000	20,000,000
Provision for losses, mortgage reinsurance							6,000,000	9,000,000	13,000,000	18,000,000
Maximum potential amount obligation												5,400,000,000	6,400,000,000																					13,000,000	5,000,000
Fair value of contingent payments																																		12,000,000	3,000,000
Guarantee obligations, carrying value												113,000,000	109,000,000	299,000,000	265,000,000	7,000,000	6,000,000
Term of representations and warranties for mortgage loan																																				30	25
Loans sold from January 1, 2005 to June 30, 2011	235,500,000,000				235,500,000,000																						30,300,000,000				181,100,000,000		24,100,000,000
Repurchase request volume	661,000,000	1,100,000,000	1,100,000,000	557,000,000	4,200,000,000																						43,000,000	55,000,000	99,000,000	148,000,000
Unpaid principal balance of loans related to unresolved requests previously received from investors	472,000,000	293,000,000			472,000,000																						37,000,000	29,000,000			435,000,000	264,000,000
Repurchased or otherwise settled mortgages																		246,000,000	375,000,000
Repurchased mortgage loans																		163,000,000		153,000,000	83,000,000	86,000,000
Amount funded by Visa into an escrow account to fund judgments and settlements relating to litigation																								6,500,000,000
Shares of Class B Visa Inc. common stock sold to another financial institution, shares																							3.2
Shares of Class B Visa Inc. common stock sold to another financial institution, value																							112,000,000
Shares of Class B Visa Inc. common stock sold to another financial institution, recognized a gain																							112,000,000
Payments to derivative counterparty																								5,000,000	17,000,000	10,000,000
Recorded a derivative liability at its estimated fair value																								$ 17,000,000	$ 23,000,000
Common stock conversion rate																							0.6296	0.4881