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Redeemable Noncontrolling Interests (Narrative) (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Aug. 26, 2015
Redeemable Noncontrolling Interest [Line Items]    
Redeemable Noncontrolling Interest, Equity, Fair Value   $ 119
naviHealth [Member]    
Redeemable Noncontrolling Interest [Line Items]    
Noncontrolling Interest, Ownership Percentage by Parent   71.00%
Redeemable Noncontrolling Interest, Equity, Fair Value $ 119