CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Cash flows from operating activities:
Net income	$ 111	$ 144
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	75	70
Provision for doubtful accounts	75	72
Deferred income tax benefit	(10)	0
Stock-based compensation expense	12	5
Excess tax benefits from stock-based compensation arrangements	0	(1)
Other, net	(2)	(1)
Changes in operating assets and liabilities:
Accounts receivable	(152)	(132)
Accounts payable and accrued expenses	(86)	(77)
Income taxes payable	70	(29)
Other assets and liabilities, net	(9)	(4)
Net cash provided by operating activities	84	47
Cash flows from investing activities:
Business acquisitions, net of cash acquired	(567)	(90)
Capital expenditures	(68)	(49)
Increase in investments and other assets	(1)	(1)
Net cash used in investing activities	(636)	(140)
Cash flows from financing activities:
Proceeds from borrowings	1,513	176
Repayments of debt	(923)	(132)
Purchases of treasury stock	(32)	(62)
Exercise of stock options	12	14
Excess tax benefits from stock-based compensation arrangements	0	1
Dividends paid	(43)	(48)
Distributions to noncontrolling interests	(3)	(3)
Other financing activities, net	(15)	(6)
Net cash provided by (used in) financing activities	509	(60)
Net change in cash and cash equivalents	(43)	(153)
Change in cash and cash equivalents included in assets held for sale	0	(9)
Cash and cash equivalents, beginning of period	187	296
Cash and cash equivalents, end of period	$ 144	$ 134