Condensed Consolidated Statements Of Cash Flows (USD $) In Millions	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Cash flows from operating activities:
Net income	$ 302	$ 254
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	81	75
Share-based compensation	26	25
Excess tax benefits related to share-based compensation	(6)	(1)
Provision for bad debts	3	4
Deferred income taxes	(18)	(5)
Loss on divestiture of businesses		11
Charges related to debt refinancing	6	37
Net income from unconsolidated investees	(2)	(2)
Loss on asset retirements	7	5
Accretion of debt discounts	12	11
Amortization of debt issuance costs	5	5
Other non-cash items included in net income	(3)	(6)
Net change in operating assets and liabilities, net of effects of acquisitions:
Receivables, net	(44)	(8)
Other assets	60	(102)
Accounts payable and accrued expenses	41	5
Section 31 fees payable to SEC	(52)	(118)
Accrued personnel costs	(17)	(21)
Deferred revenue	20	49
Other liabilities	15	39
Net cash provided by operating activities	436	257
Cash flows from investing activities:
Purchases of trading securities	(429)	(188)
Proceeds from sales and redemptions of trading securities	386	216
Proceeds from sale of equity method investment		1
Acquisitions of businesses, net of cash and cash equivalents acquired and purchase accounting adjustments	(2)	(76)
Purchases of property and equipment	(51)	(32)
Net cash used in investing activities	(96)	(79)
Cash flows from financing activities:
Purchases of noncontrolling interests		(2)
Proceeds from debt obligations, net of debt issuance costs	450	1,675
Payments of debt obligations	(570)	(1,811)
Cash paid for repurchase of common stock		(300)
Issuances of common stock, net of treasury stock purchases	9	5
Excess tax benefits related to share-based compensation	6	1
Other financing activities		2
Net cash used in financing activities	(105)	(430)
Effect of exchange rate changes on cash and cash equivalents	(7)	(6)
Net increase (decrease) in cash and cash equivalents	228	(258)
Cash and cash equivalents at the beginning of period	315	594
Cash and cash equivalents at the end of period	543	336
Cash paid for:
Interest	81	49
Income taxes, net of refund	$ 89	$ 113