CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash flows from operating activities:
Consolidated net income	$ 894	$ 658
Adjustments to reconcile consolidated net income to net cash provided by operating activities:
Depreciation and amortization	731	684
Deferred income tax benefit	(21)	(3)
Interest accretion on landfill liabilities	47	45
Provision for bad debts	22	21
Equity-based compensation expense	41	54
Net gain on disposal of assets	(10)	(5)
(Gain) loss from divestitures, asset impairments and unusual items, net	(42)	29
Equity in net losses of unconsolidated entities, net of dividends	20	17
Change in operating assets and liabilities, net of effects of acquisitions and divestitures:
Receivables	202	43
Other current assets	(9)	(3)
Other assets	(2)	(5)
Accounts payable and accrued liabilities	31	32
Deferred revenues and other liabilities	(120)	(32)
Net cash provided by operating activities	1,784	1,535
Cash flows from investing activities:
Acquisitions of businesses, net of cash acquired	(263)	(49)
Capital expenditures	(836)	(631)
Proceeds from divestitures of businesses and other assets (net of cash divested)	96	13
Other, net	(7)	(6)
Net cash used in investing activities	(1,010)	(673)
Cash flows from financing activities:
New borrowings	83	86
Debt repayments	(196)	(627)
Net commercial paper borrowings	443	253
Common stock repurchase program	(550)	(250)
Cash dividends	(406)	(381)
Exercise of common stock options	33	86
Tax payments associated with equity-based compensation transactions	(28)	(47)
Other, net	(26)	21
Net cash used in financing activities	(647)	(859)
Effect of exchange rate changes on cash, cash equivalents and restricted cash and cash equivalents	(1)
Increase in cash, cash equivalents and restricted cash and cash equivalents	126	3
Cash, cash equivalents and restricted cash and cash equivalents at beginning of period	293	94
Cash, cash equivalents and restricted cash and cash equivalents at end of period	$ 419	$ 97