CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash flows from operating activities:
Net income	$ 906	$ 788	$ 824
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	329	309	270
Provision for doubtful accounts	11	6	8
Deferred income tax provision	15	73	9
Stock-based compensation expense	56	61	79
(Gains) losses on sale of property, plant and equipment	(70)	6	2
Other, net	(39)	6	(8)
Changes in operating assets and liabilities:
Accounts receivable	(63)	(65)	9
Accounts payable and accrued expenses	73	(19)	(8)
Income taxes payable	29	4	16
Other assets and liabilities, net	(4)	31	(26)
Net cash provided by operating activities	1,243	1,200	1,175
Cash flows from investing activities:
Business acquisitions, net of cash acquired	(58)	(421)	(581)
Proceeds from disposition of business	0	2	1
Proceeds from disposition of property, plant, and equipment	91	2	1
Capital expenditures	(400)	(383)	(252)
(Increase) decrease in investments and other assets	(44)	(1)	1
Net cash used in investing activities	(411)	(801)	(830)
Cash flows from financing activities:
Proceeds from borrowings	2,281	2,090	205
Repayments of debt	(1,449)	(1,966)	(182)
Purchases of treasury stock	(353)	(322)	(465)
Exercise of stock options	119	99	130
Employee payroll tax withholdings on stock issued under stock-based compensation plans	(16)	(21)	(23)
Dividends paid	(286)	(266)	(247)
Distributions to noncontrolling interest partners	(54)	(54)	(51)
Contributions from noncontrolling interest partners	0	16	4
Other financing activities, net	(17)	23	37
Net cash provided by (used in) financing activities	225	(401)	(592)
Net change in cash and cash equivalents and restricted cash	1,057	(2)	(247)
Cash and cash equivalents and restricted cash, beginning of year	135	137	384
Cash and cash equivalents and restricted cash, end of year	1,192	135	137
Cash and cash equivalents and restricted cash, end of year	$ 135	$ 137	$ 137