CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS
Net income	$ 176	$ 78	$ 76
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	850	797	849
Provision for doubtful accounts	1,449	1,477	1,305
Deferred income tax expense	41	42	30
Stock-based compensation expense	68	69	51
Impairment and restructuring charges, and acquisition-related costs	202	318	153
Litigation and investigation (costs) benefit	293	291	25
Loss from early extinguishment of debt		1	24
Gains on sales, consolidation and deconsolidation of facilities	(151)	(186)
Equity in earnings of unconsolidated affiliates, net of distributions received	(13)	(99)	(10)
Amortization of debt discount and debt issuance costs	41	41	28
Pre-tax (income) loss from discontinued operations	6	(3)	35
Other items, net	(1)	59	(30)
Changes in cash from operating assets and liabilities:
Accounts receivable	(1,604)	(1,632)	(1,896)
Inventories and other current assets	(83)	(130)	(314)
Income taxes	(8)	18	3
Accounts payable, accrued expenses and other current liabilities	(51)	68	505
Other long-term liabilities	40	38	44
Payments for restructuring charges, acquisition-related costs, and litigation costs and settlements	(691)	(200)	(168)
Net cash used in operating activities from discontinued operations, excluding income taxes	(6)	(21)	(23)
Net cash provided by operating activities	558	1,026	687
Cash flows from investing activities:
Purchases of property and equipment - continuing operations	(875)	(842)	(933)
Purchases of businesses or joint venture interests, net of cash acquired	(117)	(940)	(428)
Proceeds from sales of facilities and other assets	573	549	6
Proceeds from sales of marketable securities, long-term investments and other assets	62	60	52
Purchases of equity investments	(39)	(134)	(12)
Other assets	(31)	(4)	(8)
Other items, net	(3)	(6)	1
Net cash used in investing activities	(430)	(1,317)	(1,322)
Cash flows from financing activities:
Repayments of borrowings under credit facility	(1,895)	(2,815)	(2,430)
Proceeds from borrowings under credit facility	1,895	2,595	2,245
Repayments of other borrowings	(154)	(2,049)	(683)
Proceeds from other borrowings	760	3,158	1,608
Repurchases of common stock		(40)
Debt issuance costs	(12)	(80)	(27)
Distributions paid to noncontrolling interests	(218)	(110)	(45)
Proceeds from sale of noncontrolling interests	22	11
Purchase of noncontrolling interest	(186)	(268)
Proceeds from exercise of stock options	4	15	26
Other items, net	16	37	21
Net cash provided by financing activities	232	454	715
Net increase in cash and cash equivalents	360	163	80
Cash and cash equivalents at beginning of period	356	193	113
Cash and cash equivalents at end of period	716	356	193
Supplemental disclosures:
Interest paid, net of capitalized interest	(932)	(859)	(726)
Income tax payments, net	$ (33)	$ (7)	$ (8)