CONSOLIDATED BALANCE SHEETS (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Sep. 30, 2011
Assets
Cash and cash equivalents	$ 2,042	$ 2,127
Restricted cash-litigation escrow (Note 2)	4,282	2,857
Investment securities
Trading	66	57
Available-for-sale	849	1,214
Settlement receivable	508	412
Accounts receivable	655	560
Customer collateral (Note 5)	898	931
Current portion of client incentives	233	278
Deferred tax assets	430	489
Prepaid expenses and other current assets	332	265
Total current assets	10,295	9,190
Investment securities, available-for-sale	1,696	711
Client incentives	98	85
Property, equipment and technology, net	1,540	1,541
Other assets	112	129
Intangible assets, net	11,437	11,436
Goodwill	11,668	11,668
Total assets	36,846	34,760
Liabilities
Accounts payable	75	169
Settlement payable	702	449
Customer collateral (Note 5)	898	931
Accrued compensation and benefits	332	387
Client incentives	750	528
Accrued liabilities	544	562
Accrued litigation (Note 11)	286	425
Total current liabilities	3,587	3,451
Deferred tax liabilities	3,941	4,205
Other liabilities (Note 6)	797	667
Total liabilities	8,325	8,323
Equity
Preferred stock, $0.0001 par value, 25 shares authorized and none issued
Additional paid-in capital	20,009	19,907
Accumulated income	8,688	6,706
Accumulated other comprehensive income (loss), net
Investment securities, available-for-sale	5
Defined benefit pension and other postretirement plans	(194)	(186)
Derivative instruments classified as cash flow hedges	17	18
Foreign currency translation adjustments	(4)	(8)
Total accumulated other comprehensive loss, net	(176)	(176)
Total equity	28,521	26,437
Total liabilities and equity	36,846	34,760
Common Class A [Member]
Equity
Common stock
Common Class B [Member]
Equity
Common stock
Common Class C [Member]
Equity
Common stock