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Dispositions and acquisitions - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 6 Months Ended |  | 6 Months Ended |  | 6 Months Ended
--- | --- | --- | --- | --- | ---
Jun. 30, 2012 | Jun. 30, 2012 Ascend Health Corporation State Facility | Jun. 30, 2011 Acute Care Hospital Services | Jun. 30, 2012 Hospital San Juan Capestrano | Jun. 30, 2012 Auburn Regional Medical Center
Significant Acquisitions and Disposals [Line Items] |  |  |  |  |
Business acquisition, cash paid |  | $ 500 |  |  |
Business acquisition, assumed liabilities |  | 17 |  |  |
Business acquisition, purchase price |  | 517 |  |  |
Number of psychiatric inpatient facilities |  | 9 |  |  |
Number of states facilities located |  | 5 |  |  |
Acquisition of a physician practice and various real properties | 11 |  |  |  |
Return of deposit on terminated purchase agreement | 6.5 |  |  |  |
Aggregate cash proceeds from divestiture of businesses | 53 |  |  |  | 98
Number of acute care hospital beds included in sale |  |  |  | 108 | 213
Net cash proceeds from the sale of a closed acute care hospital |  |  | $ 2 |  |

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