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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate.

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Income Taxes (Income Tax Contingency And Taxes Paid Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jan. 27, 2014
Income Tax Contingency [Abstract]
Unrecognized benefit that would affect the effective tax rate	$ 5
Amount of interest and penalties included in liabilities for uncertain tax positions	2
Increase (decrease) in unrecognized tax positions	(15)
Effective Income Tax Rate, Continuing Operations	23.80%	30.00%	31.50%
Goodwill	8,951us-gaap_Goodwill	4,424us-gaap_Goodwill	4,388us-gaap_Goodwill
Cash Paid for Income Taxes, Net of Refunds Received [Abstract]
Cash paid for income taxes (refunds received), net	(180)us-gaap_IncomeTaxesPaidNet	73us-gaap_IncomeTaxesPaidNet	56us-gaap_IncomeTaxesPaidNet
Adjusted for the Expense Related to Income Attributable to Noncontrolling Interest [Member]
Income Tax Contingency [Abstract]
Effective Income Tax Rate, Continuing Operations	35.50%	38.50%
Health Management Associates, Inc. [Member]
Income Tax Contingency [Abstract]
Increase (decrease) in unrecognized tax positions	26
Goodwill				$ 4,494