Income Taxes (Income Tax Contingency And Taxes Paid Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Income Tax Contingency [Abstract]
Unrecognized benefit that would affect the effective tax rate	$ 15		$ 15
Amount of interest and penalties included in liabilities for uncertain tax positions	8		8
Unrecognized tax benefit reasonably possible within 12 months	2		2
Effective Income Tax Rate, Continuing Operations	30.00%	28.20%	98.30%	31.50%
Goodwill	8,519		8,519		4,424
Cash Paid for Income Taxes, Net of Refunds Received [Abstract]
Cash paid for income taxes (refunds received), net	6	71	(73)	70
Adjusted for the Expense Related to Income Attributable to Noncontrolling Interest [Member]
Income Tax Contingency [Abstract]
Effective Income Tax Rate, Continuing Operations			35.80%	37.20%
Health Management Associates, Inc. [Member]
Income Tax Contingency [Abstract]
Goodwill	$ 4,083		$ 4,083