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Redeemable Noncontrolling Interests (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended 34 Months Ended
Sep. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Aug. 01, 2018
Jun. 30, 2016
Aug. 26, 2015
Redeemable Noncontrolling Interest [Line Items]              
Noncontrolling Interest, Ownership Percentage by Parent 98.00%   82.00%   98.00%    
Noncontrolling interest decrease from redemptions or purchase of interests percent 16.00%            
Redeemable Noncontrolling Interest, Equity, Other, Redemption Value   $ 19 $ 1 $ 103      
Redeemable Noncontrolling Interest, Equity, Redemption Value $ 109            
naviHealth [Member]              
Redeemable Noncontrolling Interest [Line Items]              
Noncontrolling Interest, Ownership Percentage by Parent           82.00% 71.00%
Fair value of redeemable noncontrolling interests             $ 119
Redeemable Noncontrolling Interest, Equity, Other, Redemption Value   $ 103 $ 3