v3.3.0.814
Legal Matters - Additional Information (Detail)
AUD in Millions, $ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended 24 Months Ended 31 Months Ended 60 Months Ended
Sep. 04, 2015
AUD
Jan. 14, 2015
merchant
Jan. 27, 2014
USD ($)
Dec. 16, 2013
USD ($)
Dec. 10, 2012
USD ($)
Oct. 29, 2012
USD ($)
Oct. 19, 2012
Oct. 31, 2011
financial_institution
Dec. 31, 2010
entity
financial_institution
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
litigation_case
case_filed
Sep. 30, 2014
USD ($)
Sep. 30, 2013
USD ($)
Sep. 30, 2015
case_filed
merchant
Sep. 30, 2015
case_filed
merchant
Dec. 31, 2004
state
Oct. 11, 2012
atm_operator
Loss Contingencies [Line Items]                                  
Distribution to class merchants, rate amount             0.10%                    
Distribution to class merchants, period             60 days                    
Consecutive months of distribution to class merchants             8 months                    
Decrease in deferred tax assets reflecting the current tax deduction related to payments made in connection with the covered litigation                     $ 1,000            
Class Plaintiffs                                  
Loss Contingencies [Line Items]                                  
Payments for legal settlements     $ 4,000   $ 4,000               $ 4,000        
Individual Plaintiffs                                  
Loss Contingencies [Line Items]                                  
Payments for legal settlements           $ 350                      
Interchange Multidistrict Litigation                                  
Loss Contingencies [Line Items]                                  
Provision for legal matters                     0 $ 1,056          
Opt-out Merchants                                  
Loss Contingencies [Line Items]                                  
Payments for legal settlements [1]                     $ 426 57          
Consumer Interchange Litigation                                  
Loss Contingencies [Line Items]                                  
Damages sought by plaintiff from all defendants       $ 54,000                          
Interchange Opt Out Litigation                                  
Loss Contingencies [Line Items]                                  
Rejoined Opt Out Merchant | merchant   1,179                              
Number of opt-out cases filed | case_filed                     50     50 50    
Settlements reached by percentage of sales volume of merchants who opted out                     48.00%     48.00% 48.00%    
Indirect Purchaser Actions                                  
Loss Contingencies [Line Items]                                  
Number of states where consumers reside | state                               19  
U.K. Merchant Litigation                                  
Loss Contingencies [Line Items]                                  
Number of plaintiffs | merchant                           20      
Merchants by sales volume with filed or preserved claims, percentage                     50.00%     50.00% 50.00%    
Canadian Competition Proceedings                                  
Loss Contingencies [Line Items]                                  
Number of Financial Institutions | financial_institution                 10                
Number of MasterCard entities | entity                 2                
Dynamic Currency Conversion                                  
Loss Contingencies [Line Items]                                  
Pecuniary penalty | AUD AUD 18                                
Costs | AUD AUD 2                                
National ATM Council Class Action                                  
Loss Contingencies [Line Items]                                  
Number of non-bank ATM operators | atm_operator                                 13
Consumer Class Actions                                  
Loss Contingencies [Line Items]                                  
Number of Financial Institutions | financial_institution               3                  
Settled Litigation                                  
Loss Contingencies [Line Items]                                  
Payments on unsettled and settled matters                     $ (446) (58)          
Threatened Litigation | Europe Interchange Rate Litigation                                  
Loss Contingencies [Line Items]                                  
Number of plaintiffs | merchant                             20    
Covered Litigation | Interchange Multidistrict Litigation                                  
Loss Contingencies [Line Items]                                  
Provision for legal matters     $ 1,100                            
Unsettled                                  
Loss Contingencies [Line Items]                                  
Provision for legal matters                     14 453          
Covered Litigation                                  
Loss Contingencies [Line Items]                                  
Deposits into litigation escrow account                   $ 450 0 450          
Covered Litigation | Interchange Multidistrict Litigation                                  
Loss Contingencies [Line Items]                                  
Provision for legal matters                     0 1,056          
Covered Litigation | Interchange Opt Out Litigation                                  
Loss Contingencies [Line Items]                                  
Provision for legal matters                     0 450          
Covered Litigation | Settled Litigation                                  
Loss Contingencies [Line Items]                                  
Payments on unsettled and settled matters                     $ (426) $ (57)          
Visa, MasterCard, and Certain U.S. Financial Institutions | Interchange Opt Out Litigation                                  
Loss Contingencies [Line Items]                                  
Number of claims filed | litigation_case                     4            
Visa | Interchange Opt Out Litigation                                  
Loss Contingencies [Line Items]                                  
Number of claims filed | litigation_case                     3            
[1] (1)These payments are associated with the interchange multidistrict litigation. See Note 20—Legal Matters.