CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 82	$ 364
Accounts receivable, less allowance for doubtful accounts ($440 at September 30, 2013 and $401 at December 31, 2012)	1,380	1,345
Inventories of supplies, at cost	154	153
Income tax receivable	3	7
Current portion of deferred income taxes	358	354
Other current assets	583	458
Total current assets	2,560	2,681
Investments and other assets	184	162
Deferred income taxes, net of current portion	396	342
Property and equipment, at cost, less accumulated depreciation and amortization ($3,756 at September 30, 2013 and $3,494 at December 31, 2012)	4,354	4,293
Goodwill	1,120	916
Other intangible assets, at cost, less accumulated amortization ($490 at September 30, 2013 and $426 at December 31, 2012)	723	650
Total assets	9,337	9,044
Current liabilities:
Current portion of long-term debt	133	94
Accounts payable	618	722
Accrued compensation and benefits	383	415
Professional and general liability reserves	74	64
Accrued interest payable	109	125
Other current liabilities	452	343
Total current liabilities	1,769	1,763
Long-term debt, net of current portion	5,690	5,158
Professional and general liability reserves	255	292
Other long-term liabilities	620	597
Total liabilities	8,334	7,810
Commitments and contingencies
Redeemable noncontrolling interests in equity of consolidated subsidiaries	83	16
Shareholders' equity:
Common stock, $0.05 par value; authorized 262,500,000 shares; 143,973,854 shares issued at September 30, 2013 and 142,363,915 shares issued at December 31, 2012	7	7
Additional paid-in capital	4,562	4,471
Accumulated other comprehensive loss	(68)	(68)
Accumulated deficit	(1,398)	(1,288)
Common stock in treasury, at cost, 44,807,632 shares at September 30, 2013 and 37,730,431 shares at December 31, 2012	(2,278)	(1,979)
Total shareholders' equity	825	1,143
Noncontrolling interests	95	75
Total equity	920	1,218
Total liabilities and equity	$ 9,337	$ 9,044