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Settlement Guarantee Management (Tables)
 6 Months Ended
Mar. 31, 2017
Business Acquisition [Line Items]  
Schedule of Customer Collateral
The Company maintained collateral as follows:

March 31,
2017
 
September 30,
2016
 
(in millions)
Cash equivalents(1)
$
1,324

 
$
1,295

Pledged securities at market value
154

 
170

Letters of credit
1,477

 
1,311

Guarantees
1,369

 
1,418

Total
$
4,324

 
$
4,194
Visa Europe  
Business Acquisition [Line Items]  
Schedule of Customer Collateral

(1) 
Cash collateral held by Visa Europe is not included on the Company's consolidated balance sheets as its clients retain beneficial ownership and the cash is only accessible to the Company in the event of default by the client on its settlement obligations.