v3.5.0.2

Fair Value Measurements (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unsecured Long-term Debt, Noncurrent		$ 852
Long-term investment in equity securities	$ 427	299
U.S. Treasury securities	503	449
Mutual Funds	24	29
Total assets at fair value	954	777
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term investment in equity securities	427	299
Mutual Funds	24	29
Total assets at fair value	954	777
Narrative [Abstract]
Equity method investments, fair value	503	449
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term investment in equity securities	0	0
U.S. Treasury securities	0	0
Mutual Funds	0	0
Total assets at fair value	0	0
Cash and Cash Equivalents [Member]
Narrative [Abstract]
Equity method investments, fair value	33
Restricted Cash And Investments [Member]
Narrative [Abstract]
Equity method investments, fair value	320
Restricted Cash and Investments, Non Current [Member]
Narrative [Abstract]
Equity method investments, fair value	150
Two Thousand Twenty Senior Notes [Member]
Narrative [Abstract]
Fair value of senior notes	1,300
Senior Notes [Member]
Narrative [Abstract]
Fair value of senior notes	1,350
NYSE Euronext USD Notes [Member]
Narrative [Abstract]
Fair value of senior notes	860
Cetip, S.A. [Member]
Narrative [Abstract]
Available-for-sale Securities, Equity Securities	427
Available-for-sale Securities, Gross Unrealized Gain (Loss)	103
Two Thousand Twenty Senior Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unsecured Long-term Debt, Noncurrent	1,240	789
Two Thousand Twenty Three Senior Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unsecured Long-term Debt, Noncurrent	789	1,240
Narrative [Abstract]
Fair value of senior notes	865
Senior Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unsecured Long-term Debt, Noncurrent	1,241
NYSE Euronext USD Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unsecured Long-term Debt, Noncurrent	852	597
Two Thousand Eighteen Senior Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unsecured Long-term Debt, Noncurrent	597	$ 1,239
Narrative [Abstract]
Fair value of senior notes	$ 615

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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Fair value portion of investments accounted under the equity method.

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The fair value as of the balance sheet date of firm holdings in debt obligations issued by the US government including short-term Treasury bills, medium-term Treasury notes, and long-term Treasury bonds, as well as debt issued by agencies. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings.

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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The total amount of investments that are intended to be held for an extended period of time (longer than one operating cycle).

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Carrying value as of the balance sheet date of uncollateralized debt obligation (with maturities initially due after one year or beyond the operating cycle if longer), excluding current portion.

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