CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash flows from operating activities:
Net income	$ 553	$ 392
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	230	235
Provision for doubtful accounts	232	224
Deferred income tax provision (benefit)	138	(21)
Stock-based compensation expense	39	38
Excess tax benefits from stock-based compensation arrangements	(4)	0
Gain on contribution of business to joint venture	(334)	0
Other, net	(4)	(5)
Changes in operating assets and liabilities:
Accounts receivable	(214)	(260)
Accounts payable and accrued expenses	(41)	20
Income taxes payable	(15)	22
Other assets and liabilities, net	(41)	(10)
Net cash provided by operating activities	539	635
Cash flows from investing activities:
Business acquisitions, net of cash acquired	(41)	(725)
Capital expenditures	(169)	(219)
Investment in equity method investee	(37)	0
Decrease in investments and other assets	10	10
Net cash used in investing activities	(237)	(934)
Cash flows from financing activities:
Proceeds from borrowings	2,214	1,953
Repayments of debt	(2,235)	(1,466)
Purchases of treasury stock	(174)	(82)
Exercise of stock options	58	55
Excess tax benefits from stock-based compensation arrangements	4	0
Dividends paid	(158)	(139)
Distributions to noncontrolling interests	(28)	(23)
Sale of noncontrolling interest in subsidiary	51	0
Payment of deferred business acquisition consideration	(51)	0
Other financing activities, net	(52)	(16)
Net cash (used in) provided by financing activities	(371)	282
Net change in cash and cash equivalents	(69)	(17)
Cash and cash equivalents, beginning of period	192	187
Cash and cash equivalents, end of period	$ 123	$ 170