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Investments (Narrative) (Details) - naviHealth [Member] - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Aug. 01, 2018
Investment [Line Items] |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  | 44.00%
Partnership Indirect Ownership |  | 100.00%
Equity Method Investments | $ 343 | $ 358
Income (Loss) from Equity Method Investments | 1 |
Proceeds from Equity Method Investment, Distribution, Return of Capital | $ 14 |

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