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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Cash flows from operating activities:    
Net income $ 299 $ 415
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 174 165
Provision for credit losses 13 5
Deferred income tax provision 23 13
Stock-based compensation expense 31 32
Other, net 3 (33)
Changes in operating assets and liabilities:    
Accounts receivable (75) (81)
Accounts payable and accrued expenses 42 27
Income taxes payable 51 15
Termination of interest rate swap agreements 40 0
Other assets and liabilities, net 1 38
Net cash provided by operating activities 602 596
Cash flows from investing activities:    
Business acquisitions, net of cash acquired (228) (56)
Capital expenditures (165) (132)
Increase in investments and other assets (18) (14)
Net cash used in investing activities (411) (202)
Cash flows from financing activities:    
Proceeds from borrowings 749 1,484
Repayments of debt (1,001) (1,448)
Purchases of treasury stock (75) (103)
Exercise of stock options 117 66
Employee payroll tax withholdings on stock issued under stock-based compensation plans (13) (16)
Dividends paid (146) (143)
Distributions to noncontrolling interest partners (10) (27)
Other financing activities, net (16) (69)
Net cash used in financing activities (395) (256)
Net change in cash and cash equivalents and restricted cash (204) 138
Cash and cash equivalents and restricted cash, beginning of period 1,192 135
Cash and cash equivalents and restricted cash, end of period $ 988 $ 273