Income Taxes- Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning balance of unrecognized tax benefits	$ 107	$ 145
Additions (reductions) related to acquisitions	22	7	$ 0
Additions based on tax positions related to current year	9	9	33
Additions based on tax positions related to prior years	0	34	1
Reductions related to divestitures (Euronext IPO)	0	0	(104)
Reductions based on tax positions related to prior years	(1)	(51)	(3)
Reductions resulting from statute of limitation lapses	(3)	(12)	(2)
Reductions related to settlements with taxing authorities	(22)	(25)	(8)
Ending balance of unrecognized tax benefits	$ 112	$ 107	$ 145

Unrecognized Tax Benefits, Decrease Resulting From Divestitures

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- Definition

Unrecognized Tax Benefits Increases Decreases Resulting From Acquisition.

+ References

No definition available.

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Definition

Amount of unrecognized tax benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=65882285&loc=SL6600010-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Unrecognized Tax Benefit
-URI http://asc.fasb.org/extlink&oid=6527854

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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities.

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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

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