CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities:
Net income	$ 1,499	$ 906	$ 788
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	361	329	309
Provision for credit losses	19	11	6
Deferred income tax provision	85	15	73
Stock-based compensation expense	97	56	61
Losses (gains) on sale of property, plant and equipment	3	(70)	6
Other, net	(81)	(39)	6
Changes in operating assets and liabilities:
Accounts receivable	(455)	(63)	(65)
Accounts payable and accrued expenses	452	73	(19)
Income taxes payable	22	29	4
Termination of interest rate swap agreements	40	0	0
Other assets and liabilities, net	(37)	(4)	31
Net cash provided by operating activities	2,005	1,243	1,200
Cash flows from investing activities:
Business acquisitions, net of cash acquired	(330)	(58)	(421)
Proceeds from disposition of property, plant, and equipment	3	91	2
Capital expenditures	(418)	(400)	(383)
(Increase) decrease in investments and other assets	(27)	(44)	1
Net cash used in investing activities	(772)	(411)	(801)
Cash flows from financing activities:
Proceeds from borrowings	749	2,281	2,090
Repayments of debt	(1,554)	(1,449)	(1,966)
Purchases of treasury stock	(325)	(353)	(322)
Exercise of stock options	189	119	99
Employee payroll tax withholdings on stock issued under stock-based compensation plans	(15)	(16)	(21)
Dividends paid	(297)	(286)	(266)
Distributions to noncontrolling interest partners	(58)	(54)	(54)
Contributions from noncontrolling interest partners	0	0	16
Other financing activities, net	44	(17)	23
Net cash (used in) provided by financing activities	(1,267)	225	(401)
Net change in cash and cash equivalents and restricted cash	(34)	1,057	(2)
Cash and cash equivalents and restricted cash, beginning of year	1,192	135	137
Cash and cash equivalents and restricted cash, end of year	$ 1,158	$ 1,192	$ 135