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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash flows from operating activities:      
Net income $ 788 $ 824 $ 696
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 309 270 249
Provision for doubtful accounts 6 8 7
Deferred income tax provision 73 9 37
Stock-based compensation expense 61 79 69
Loss (gain) on disposition of business 4 0 (118)
Payment for debt extinguishment costs 0 0 43
Other, net 8 (6) (2)
Changes in operating assets and liabilities:      
Accounts receivable (65) 9 (42)
Accounts payable and accrued expenses (19) (8) 56
Income taxes payable 4 16 42
Termination of interest rate swap agreements 0 0 54
Other assets and liabilities, net 31 (26) 25
Net cash provided by operating activities 1,200 1,175 1,116
Cash flows from investing activities:      
Business acquisitions, net of cash acquired (421) (581) (139)
Proceeds from disposition of business 2 1 295
Capital expenditures (383) (252) (293)
Decrease in investments and other assets 1 2 10
Net cash used in investing activities (801) (830) (127)
Cash flows from financing activities:      
Proceeds from borrowings 2,090 205 1,869
Repayments of debt (1,966) (182) (1,728)
Purchases of treasury stock (322) (465) (590)
Exercise of stock options 99 130 73
Employee payroll tax withholdings on stock issued under stock-based compensation plans (21) (23) (10)
Dividends paid (266) (247) (223)
Distributions to noncontrolling interest partners (54) (51) (41)
Payment of debt extinguishment costs 0 0 (43)
Contributions from noncontrolling interest partners 16 4 0
Other financing activities, net 23 37 (45)
Net cash used in financing activities (401) (592) (738)
Net change in cash and cash equivalents and restricted cash (2) (247) 251
Cash and cash equivalents and restricted cash, beginning of year 137 384 133
Cash and cash equivalents and restricted cash, end of year 135 137 384
Cash and cash equivalents and restricted cash, end of year $ 137 $ 384 $ 133