CONSOLIDATED BALANCE SHEETS (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Sep. 30, 2012
Assets
Cash and cash equivalents	$ 1,377	$ 2,074
Restricted cash—litigation escrow (Note 2)	49	4,432
Investment securities
Trading	72	66
Available-for-sale	1,270	677
Income tax receivable	1,163	179
Settlement receivable	488	454
Accounts receivable	802	723
Customer collateral (Note 6)	846	823
Current portion of client incentives	215	209
Deferred tax assets	421	2,027
Prepaid expenses and other current assets	211	122
Total current assets	6,914	11,786
Investment securities, available-for-sale	2,974	3,283
Client incentives	100	58
Property, equipment and technology, net	1,674	1,634
Other assets	331	151
Intangible assets, net	11,385	11,420
Goodwill	11,681	11,681
Total assets	35,059	40,013
Liabilities
Accounts payable	118	152
Settlement payable	722	719
Customer collateral (Note 6)	846	823
Accrued compensation and benefits	358	460
Client incentives	890	830
Accrued liabilities	599	584
Accrued litigation (Note 11)	6	4,386
Total current liabilities	3,539	7,954
Deferred tax liabilities	4,046	4,058
Other liabilities	579	371
Total liabilities	8,164	12,383
Equity
Preferred stock, $0.0001 par value, 25 shares authorized and none issued
Additional paid-in capital	19,305	19,992
Accumulated income	7,723	7,809
Accumulated other comprehensive income (loss), net
Investment securities, available-for-sale	35	3
Defined benefit pension and other postretirement plans	(183)	(186)
Derivative instruments classified as cash flow hedges	16	13
Foreign currency translation adjustments	(1)	(1)
Total accumulated other comprehensive loss, net	(133)	(171)
Total equity	26,895	27,630
Total liabilities and equity	35,059	40,013
Class A common stock
Equity
Common stock
Class B common stock
Equity
Common stock
Class C common stock
Equity
Common stock