Commitments And Contingencies (Property Insurance And Other) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011
Loss Contingencies [Line Items]
Commercial property insurance for catastrophic losses limit per occurrence	1,000,000,000
Commercial property insurance for catastrophic losses deductible limit per occurrence	250,000
Combined estimated future purchase obligations	130,000,000
Combined estimated future payments related to non contributory	227,000,000
Defined benefit pension plan estimated payments through 2088	212,000,000
Other retirement plan liabilities	15,000,000
Earthquake [Member]
Loss Contingencies [Line Items]
Commercial property insurance for catastrophic losses limit per occurrence	250,000,000
Commercial property insurance for catastrophic losses deductible limit per occurrence	250,000
Revenue Cycle Data Processing Services [Member]
Loss Contingencies [Line Items]
Combined estimated future purchase obligations	58,000,000
Electronic Health Records Application [Member]
Loss Contingencies [Line Items]
Combined estimated future purchase obligations	66,000,000
Estimated Minimum Liabilities For Physician Commitments [Member]
Loss Contingencies [Line Items]
Combined estimated future purchase obligations	6,000,000
Minimum [Member] | Windstorms [Member]
Loss Contingencies [Line Items]
Commercial property insurance for catastrophic losses, deductible rate	3.00%
Minimum [Member] | Earthquake [Member]
Loss Contingencies [Line Items]
Commercial property insurance for catastrophic losses, deductible rate	1.00%
Minimum [Member] | Flood [Member]
Loss Contingencies [Line Items]
Commercial property insurance for catastrophic losses deductible limit per occurrence	250,000
Maximum [Member] | Windstorms [Member]
Loss Contingencies [Line Items]
Commercial property insurance for catastrophic losses, deductible rate	5.00%
Maximum [Member] | Earthquake [Member]
Loss Contingencies [Line Items]
Commercial property insurance for catastrophic losses, deductible rate	5.00%
Maximum [Member] | Flood [Member]
Loss Contingencies [Line Items]
Commercial property insurance for catastrophic losses deductible limit per occurrence	500,000
Facilities Located In Fault Zones [Member] | Earthquake [Member]
Loss Contingencies [Line Items]
Commercial property insurance for catastrophic losses limit per occurrence	100,000,000
Letters Of Credit And Surety Bonds [Member]
Loss Contingencies [Line Items]
Off-balance sheet contingent obligation	79,000,000
Letters Of Credit And Surety Bonds [Member] | Self-Insurance Programs [Member]
Loss Contingencies [Line Items]
Off-balance sheet contingent obligation	62,000,000
Letters Of Credit And Surety Bonds [Member] | Other Debt Guarantees [Member]
Loss Contingencies [Line Items]
Off-balance sheet contingent obligation	17,000,000
Puerto Rico [Member] | Earthquake [Member]
Loss Contingencies [Line Items]
Commercial property insurance for catastrophic losses deductible limit per occurrence	25,000,000