CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash flows from operating activities:
Consolidated net income	$ 1,949	$ 1,180	$ 752
Adjustments to reconcile consolidated net income to net cash provided by operating activities:
Depreciation and amortization	1,376	1,301	1,245
Deferred income tax expense (benefit)	(251)	73	30
Interest accretion on landfill liabilities	92	91	89
Interest accretion on and discount rate adjustments to environmental remediation liabilities and recovery assets	3		1
Provision for bad debts	43	42	36
Equity-based compensation expense	101	90	72
Net gain on disposal of assets	(20)	(24)	(18)
Expense from divestitures, asset impairments and other, net	43	110	87
Equity in net losses of unconsolidated entities, net of dividends	39	44	42
Loss on early extinguishment of debt	6	4	555
Change in operating assets and liabilities, net of effects of acquisitions and divestitures:
Receivables	(271)	(78)	(178)
Other current assets	(20)	(12)	16
Other assets	4	78	(7)
Accounts payable and accrued liabilities	126	192	(97)
Deferred revenues and other liabilities	(40)	(85)	(97)
Net cash provided by operating activities	3,180	3,006	2,528
Cash flows from investing activities:
Acquisitions of businesses, net of cash acquired	(200)	(611)	(554)
Capital expenditures	(1,509)	(1,339)	(1,233)
Proceeds from divestitures of businesses and other assets (net of cash divested)	99	43	145
Net receipts from restricted trust and escrow accounts	243		51
Other, net	(12)	(25)	(17)
Net cash used in investing activities	(1,379)	(1,932)	(1,608)
Cash flows from financing activities:
New borrowings	1,027	3,057	2,337
Debt repayments	(1,907)	(2,682)	(2,764)
Net commercial paper borrowings	513
Premiums paid on early extinguishment of debt	(8)	(2)	(555)
Common stock repurchase program	(750)	(725)	(600)
Cash dividends	(750)	(726)	(695)
Exercise of common stock options	95	63	77
Tax payments associated with equity-based compensation transactions	(47)	(30)	(15)
Other, net	16	(36)	30
Net cash used in financing activities	(1,811)	(1,081)	(2,185)
Effect of exchange rate changes on cash and cash equivalents			(3)
Decrease in cash and cash equivalents	(10)	(7)	(1,268)
Cash and cash equivalents at beginning of year	32	39	1,307
Cash and cash equivalents at end of year	$ 22	$ 32	$ 39