Acquisitions and Divestitures (Acquisitions) (Tables) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 01, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Goodwill	$ 2,968			$ 1,387
SNL Financial LC [Member]
Business Acquisition [Line Items]
Current assets			$ 22
Property, plant and equipment			19
Goodwill			1,558
Other intangible assets, net:
Other intangible assets, net			772
Other non-current assets			3
Total assets acquired			2,374
Current liabilities			(19)
Unearned revenue			(118)
Other non-current liabilities			(6)
Total liabilities acquired			143
Net assets acquired			2,231
Supplemental Pro Forma Information
Pro forma revenue	4,124	$ 3,927
Pro forma net income from continuing operations	$ 954	$ 746
Databases and Software [Member] | SNL Financial LC [Member]
Other intangible assets, net:
Other intangible assets, net			421
Customer Relationships [Member] | SNL Financial LC [Member]
Other intangible assets, net:
Other intangible assets, net			162
Tradenames [Member] | SNL Financial LC [Member]
Other intangible assets, net:
Other intangible assets, net			185
Other Intangibles [Member] | SNL Financial LC [Member]
Other intangible assets, net:
Other intangible assets, net			$ 4