Settlement Guarantee Management (Tables)

12 Months Ended

Sep. 30, 2018

Settlement Guarantee Management [Abstract]

Schedule of Customer Collateral

At September 30, 2018 and 2017, the Company held the following collateral to manage settlement exposure:

	September 30, 2018		September 30, 2017
	(in millions)
Cash equivalents	$	1,708	$	1,490
Pledged securities at market value	192		167
Letters of credit	1,382		1,316
Guarantees	860		941
Total	$	4,142	$	3,914