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Divestitures (Narrative) (Details) - naviHealth [Member] - USD ($) $ in Millions |  | 6 Months Ended
--- | --- | ---
Aug. 01, 2018 | Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Noncontrolling Interest, Ownership Percentage by Parent | 98.00% |
Proceeds from Divestiture of Businesses | $ 737 |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners | 44.00% |
Partnership Indirect Ownership | 100.00% |
Pre-Tax Gain on Divestiture |  | $ 508
Equity Method Investments | $ 358 | 343
Redeemable Non Controlling Interest Divested | $ 12 |
Tax Expense From Divestiture of a Business |  | $ 130

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