CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 95	$ 364
Accounts receivable, less allowance for doubtful accounts ($407 at March 31, 2013 and $401 at December 31, 2012)	1,383	1,345
Inventories of supplies, at cost	152	153
Income tax receivable	4	7
Current portion of deferred income taxes	354	354
Other current assets	455	458
Total current assets	2,443	2,681
Investments and other assets	163	162
Deferred income taxes, net of current portion	395	342
Property and equipment, at cost, less accumulated depreciation and amortization ($3,580 at March 31, 2013 and $3,494 at December 31, 2012)	4,296	4,293
Goodwill	948	916
Other intangible assets, at cost, less accumulated amortization ($447 at March 31, 2013 and $426 at December 31, 2012)	670	650
Total assets	8,915	9,044
Current liabilities:
Current portion of long-term debt	52	94
Accounts payable	625	722
Accrued compensation and benefits	373	415
Professional and general liability reserves	49	64
Accrued interest payable	99	125
Other current liabilities	351	343
Total current liabilities	1,549	1,763
Long-term debt, net of current portion	5,375	5,158
Professional and general liability reserves	298	292
Other long-term liabilities	611	597
Total liabilities	7,833	7,810
Commitments and contingencies
Redeemable noncontrolling interests in equity of consolidated subsidiaries	36	16
Shareholders' equity:
Common stock, $0.05 par value; authorized 262,500,000 shares; 143,597,960 shares issued at March 31, 2013 and 142,363,915 shares issued at December 31, 2012	7	7
Additional paid-in capital	4,484	4,471
Accumulated other comprehensive loss	(68)	(68)
Accumulated deficit	(1,376)	(1,288)
Common stock in treasury, at cost, 40,172,225 shares at March 31, 2013 and 37,730,431 shares at December 31, 2012	(2,078)	(1,979)
Total shareholders' equity	969	1,143
Noncontrolling interests	77	75
Total equity	1,046	1,218
Total liabilities and equity	$ 8,915	$ 9,044