Acquisitions and Divestitures (Components of Assets and Liabilities, and Operating Profits, of Businesses Held for Sale) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Assets and Liabilities of Business Held for Sale
Liabilities of businesses held for sale	$ 24		$ 24		$ 206
Operating Profit of Business Held for Sale
Gain on sale of business	722	$ 0	722	$ 11
J.D. Power, SPSE, and CMA | Disposal Group, Held-for-sale, Not Discontinued Operations
Assets and Liabilities of Business Held for Sale
Accounts receivable, net	23		23		58
Goodwill	38		38		75
Other intangible assets, net	3		3		335
Other assets	2		2		35
Assets of businesses held for sale	66		66		503
Accounts payable and accrued expenses	4		4		42
Unearned revenue	18		18		64
Other liabilities	2		2		100
Liabilities of businesses held for sale	24		24		$ 206
J.D. Power, SPSE, and CMA | Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations
Operating Profit of Business Held for Sale
Operating profit 1	37	$ 33	88	$ 84
S&P Global Platts
Operating Profit of Business Held for Sale
Gain on sale of business	722		722
S&P Global Platts | J.D. Power | Disposal Group, Disposed of by Sale, Not Discontinued Operations
Operating Profit of Business Held for Sale
Gain on sale of business	$ 722		$ 722