CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash flows from operating activities:
Net income	$ 175	$ 115
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	62	62
Provision for doubtful accounts	84	86
Deferred income tax provision	11	8
Stock-based compensation expense	17	18
Other, net	1	1
Changes in operating assets and liabilities:
Accounts receivable	(117)	(145)
Accounts payable and accrued expenses	(95)	(69)
Income taxes payable	63	62
Other assets and liabilities, net	(5)	15
Net cash provided by operating activities	196	153
Cash flows from investing activities:
Business acquisitions, net of cash acquired	(1)	(135)
Escrow proceeds associated with disposition of business	25	0
Capital expenditures	(42)	(47)
Increase in investments and other assets	(4)	(8)
Net cash used in investing activities	(22)	(190)
Cash flows from financing activities:
Proceeds from borrowings	0	665
Repayments of debt	(2)	(453)
Purchases of treasury stock	(150)	(115)
Exercise of stock options	46	7
Employee payroll tax withholdings on stock issued under stock-based compensation plans	(22)	(8)
Dividends paid	(62)	(55)
Distributions to noncontrolling interests	(9)	(9)
Other financing activities, net	33	0
Net cash (used in) provided by financing activities	(166)	32
Net change in cash and cash equivalents	8	(5)
Cash and cash equivalents, beginning of period	359	133
Cash and cash equivalents, end of period	$ 367	$ 128