Acquisitions and Divestitures (Schedule of Net Operating Revenues and Income (Loss) and Assets and Liabilities Classified as Discontinued Operations) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Acquisitions And Divestitures [Abstract]
Net operating revenues	$ 56	$ 89
Loss from operations of entities sold or held for sale before income taxes	(17)	(7)
Impairment of hospitals held for sale before income taxes	(1)	(22)
Loss on sale, net	(1)
Loss from discontinued operations, before taxes	(19)	(29)
Income tax benefit	(6)	(7)
Loss from discontinued operations, net of taxes	$ (13)	$ (22)

Acquisitions and Divestitures (Schedule of Net Operating Revenues and Income (Loss) and Assets and Liabilities Classified as Discontinued Operations) (Details) (USD $)
In Millions, unless otherwise specified

3 Months Ended

Mar. 31, 2015

Mar. 31, 2014

Acquisitions And Divestitures [Abstract]

Net operating revenues

$ 56

$ 89

Loss from operations of entities sold or held for sale before income taxes

(17)

(7)

Impairment of hospitals held for sale before income taxes

Loss from discontinued operations, before taxes

Loss from discontinued operations, net of taxes

$ (13)

$ (22)

- Definition

Overall income (loss) from a disposal group that is classified as a component of the entity, before income tax, reported as a separate component of income before extraordinary items. Includes the following (before income tax): income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

+ References+ Details

- Definition

Tax effect allocated to a disposal group that is classified as a component of the entity reported as a separate component of income before extraordinary items. Includes the tax effects of the following: income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

+ References+ Details

- Definition

Amount of income (loss) from a disposal group, net of income tax before extraordinary items allocable to noncontrolling interests. Includes, net of tax, income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

+ References+ Details