Subsequent Events (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended		9 Months Ended
	Oct. 17, 2016	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Oct. 03, 2016	Dec. 31, 2015
Subsequent Event [Line Items]
Current assets		$ 4,541		$ 4,541			$ 5,166
Current liabilities		2,686		2,686			$ 3,072
Net operating revenues		4,380	$ 4,846	13,969	$ 14,639
Income from continuing operations before income taxes		(83)	$ 121	$ (1,563)	$ 502
Home Care [Member]
Subsequent Event [Line Items]
Disposal Date				Oct. 17, 2016
Current assets		34		$ 34
Long-term assets		53		53
Current liabilities		$ 16		16
Net operating revenues				148
Income from continuing operations before income taxes				$ 11
Subsequent Event [Member]
Subsequent Event [Line Items]
Flip-in Date Optional						15.00%
Flip-in Date Automatic Triggering Percentage						40.00%
Exercise Price Per Share of Each Stockholder Protection Right						$ 50.00
Acquiring Ownership of CHS Stock for Mandatory Exchange of Stockholder Protection Right						50.00%
Redemptive price Per Share of Stockholder Protection Rights						$ 0.001
Subsequent Event [Member] | Home Care [Member]
Subsequent Event [Line Items]
Percentage of ownership interest sold	80.00%
Minimum [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Acquiring Ownership of CHS Stock for Optional Exchange of Stockholder Protection Right						15.00%
Maximum [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Acquiring Ownership of CHS Stock for Optional Exchange of Stockholder Protection Right						50.00%