Supplemental Disclosures to the Consolidated Statements of Cash Flows (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Deferred and contingent consideration from prior years acquisition	$ 39	$ 32
Contingent consideration from prior year's acquisitions	14	6
Net charge for adjustments related to acquisition related accounts	5	10
Payment of contingent consideration	4	12
Non-cash issuance of common stock	67	64
Stock-based compensation expense, equity awards	20	16
Prior Fiscal Periods Acquisitions
Deferred purchase consideration from prior years' acquisitions	25	26
Contingent consideration from prior year's acquisitions	$ 18	19
Putnam
Reduction of net cash flow for operations by discontinued operations		$ 82