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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Cash flows from operating activities:    
Net income $ 114 $ 70
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 62 78
Provision for doubtful accounts 86 79
Deferred income tax provision 8 14
Stock-based compensation expense 18 12
Excess tax benefits from stock-based compensation arrangements (2) (2)
Other, net 1 7
Changes in operating assets and liabilities:    
Accounts receivable (145) (97)
Accounts payable and accrued expenses (77) (120)
Income taxes payable 63 10
Other assets and liabilities, net 15 1
Net cash provided by operating activities 143 52
Cash flows from investing activities:    
Business acquisitions, net of cash acquired (135) 0
Capital expenditures (47) (56)
(Increase) decrease in investments and other assets (8) 1
Net cash used in investing activities (190) (55)
Cash flows from financing activities:    
Proceeds from borrowings 665 1,389
Repayments of debt (453) (440)
Purchases of treasury stock (115) (110)
Exercise of stock options 7 35
Excess tax benefits from stock-based compensation arrangements 2 2
Dividends paid (55) (48)
Distributions to noncontrolling interests (9) (10)
Other financing activities, net 0 (33)
Net cash provided by financing activities 42 785
Net change in cash and cash equivalents (5) 782
Cash and cash equivalents, beginning of period 133 192
Cash and cash equivalents, end of period $ 128 $ 974