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Acquisitions (2015 Acquisitions Dorsey, Wright & Associates) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015	Jan. 30, 2015
Business Acquisition [Line Items]
Goodwill	$ 6,027	$ 5,395
DWA
Business Acquisition [Line Items]
Purchase Consideration			$ 226
Total Net Assets (Liabilities) Acquired			8
Total Net Deferred Tax Liability			(34)
Acquired intangible assets		$ 141	141
Goodwill			$ 111

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Amount of deferred tax liability attributable to taxable temporary differences assumed at the acquisition date.

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The amount of identifiable intangible assets recognized as of the acquisition date.

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Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed.

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Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed.

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