CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash flows from operating activities:
Net income	$ 753	$ 592	$ 883
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	304	314	283
Provision for doubtful accounts	297	296	270
Deferred income tax provision	112	23	19
Stock-based compensation expense	52	51	28
Excess tax benefits from stock-based compensation arrangements	(5)	0	(4)
Gain on contribution of business to joint venture	(334)	0	0
Gain on sale of royalty rights	0	0	(474)
Other, net	6	(12)	19
Changes in operating assets and liabilities:
Accounts receivable	(262)	(312)	(247)
Accounts payable and accrued expenses	(31)	68	(21)
Income taxes payable	(41)	(84)	(93)
Other assets and liabilities, net	(41)	2	(11)
Net cash provided by operating activities	810	938	652
Cash flows from investing activities:
Business acquisitions, net of cash acquired	(67)	(728)	(213)
Proceeds from sale of businesses	0	0	296
Proceeds from sale of royalty rights	0	0	474
Capital expenditures	(263)	(308)	(231)
Investment in equity method investee	(33)	0	0
Decrease in investments and other assets	1	11	2
Net cash (used in) provided by investing activities	(362)	(1,025)	328
Cash flows from financing activities:
Proceeds from borrowings	2,453	2,018	896
Repayments of debt	(2,537)	(1,647)	(900)
Purchases of treasury stock	(224)	(132)	(1,037)
Exercise of stock options	60	78	138
Excess tax benefits from stock-based compensation arrangements	5	0	4
Dividends paid	(212)	(187)	(185)
Distributions to noncontrolling interests	(42)	(31)	(32)
Sale of noncontrolling interest in subsidiary	63	0	0
Payment of deferred business acquisition consideration	(51)	0	0
Other financing activities, net	(22)	(7)	10
Net cash (used in) provided by financing activities	(507)	92	(1,106)
Net change in cash and cash equivalents	(59)	5	(126)
Change in cash and cash equivalents included in assets held for sale	0	0	17
Cash and cash equivalents, beginning of year	192	187	296
Cash and cash equivalents, end of year	$ 133	$ 192	$ 187