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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Cash flows from operating activities:    
Net income $ 641 $ 649
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 247 228
Provision for doubtful accounts 9 2
Deferred income tax provision 15 52
Stock-based compensation expense 44 53
Other, net (44) 7
Changes in operating assets and liabilities:    
Accounts receivable (113) (166)
Accounts payable and accrued expenses 80 51
Income taxes payable 9 (1)
Other assets and liabilities, net 7 30
Net cash provided by operating activities 895 905
Cash flows from investing activities:    
Business acquisitions, net of cash acquired (56) (219)
Capital expenditures (228) (232)
Increase in investments and other assets (27) (4)
Net cash used in investing activities (311) (455)
Cash flows from financing activities:    
Proceeds from borrowings 1,484 1,630
Repayments of debt (1,448) (1,665)
Purchases of treasury stock (153) (150)
Exercise of stock options 98 95
Employee payroll tax withholdings on stock issued under stock-based compensation plans (16) (20)
Dividends paid (215) (198)
Distributions to noncontrolling interest partners (39) (41)
Contributions from noncontrolling interest partners 0 12
Other financing activities, net 4 13
Net cash used in financing activities (285) (324)
Net change in cash and cash equivalents and restricted cash 299 126
Cash and cash equivalents and restricted cash, beginning of period 135 137
Cash and cash equivalents and restricted cash, end of period 434 263
Cash and cash equivalents 135  
Cash and cash equivalents and restricted cash, end of period $ 135 $ 137