CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Cash flows from operating activities:
Net income	$ 529	$ 553
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	186	230
Provision for doubtful accounts	242	232
Deferred income tax provision	19	138
Stock-based compensation expense	52	39
Gain on disposition of business	(118)	(334)
Other, net	(15)	(4)
Changes in operating assets and liabilities:
Accounts receivable	(316)	(214)
Accounts payable and accrued expenses	43	(35)
Income taxes payable	74	(15)
Termination of interest rate swap agreements	54	0
Other assets and liabilities, net	15	(41)
Net cash provided by operating activities	765	549
Cash flows from investing activities:
Business acquisitions, net of cash acquired	(139)	(41)
Proceeds from disposition of businesses	270	0
Capital expenditures	(165)	(169)
Investment in equity method investee	0	37
(Increase) decrease in investments and other assets	(11)	10
Net cash used in investing activities	(45)	(237)
Cash flows from financing activities:
Proceeds from borrowings	1,869	2,214
Repayments of debt	(1,722)	(2,235)
Purchases of treasury stock	(440)	(174)
Exercise of stock options	63	58
Employee payroll tax withholdings on stock issued under stock-based compensation plans	(10)	(6)
Dividends paid	(168)	(158)
Distributions to noncontrolling interests	(31)	(28)
Sale of noncontrolling interest in subsidiary	0	51
Payment of deferred business acquisition consideration	0	51
Other financing activities, net	(8)	(52)
Net cash used in financing activities	(447)	(381)
Net change in cash and cash equivalents	273	(69)
Cash and cash equivalents, beginning of period	133	192
Cash and cash equivalents, end of period	$ 406	$ 123