INVESTMENTS AND OTHER ASSETS (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Investment and other assets
Marketable debt securities	$ 15	$ 22
Equity investments in unconsolidated health care entities	22	23
Total investments	37	45
Cash surrender value of life insurance policies	21	18
Long-term deposits	16	47
Land held for expansion, long-term receivables and other assets	88	46
Investments and other assets	162	156
Equity earnings of unconsolidated affiliates	8	8
Accumulated unrealized gains on investments, maximum	$ 1	$ 1