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Business Acquisition (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 31, 2019 | Mar. 31, 2019 | Mar. 31, 2018 | Jan. 01, 2019 | Dec. 31, 2018
Business Acquisition [Line Items] |  |  |  |  |
Revenues |  | $ 1,158 | $ 1,420 |  |
Goodwill |  | 3,171 |  |  | $ 3,408
Health Solutions Plus [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Revenues |  | 4 |  |  |
Business Combination, Consideration Transferred | $ 90 | 90 |  |  |
Business Combination, Contingent Consideration, Liability |  | 7 |  |  |
Business Acquisition, Total consideration |  | 97 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net |  | 10 |  |  |
Goodwill |  | 48 |  |  |
Intangible Assets, Net (Including Goodwill) |  | 87 |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net |  | 97 |  |  |
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High |  | $ 8 |  |  |
Business Combination, Contingent Consideration Arrangements Period |  | 2 years |  |  |
Goodwill, Portion Currently Not Tax Deductible |  |  |  | $ 7 |
Income (Loss) from Subsidiaries, before Tax |  | $ 3 |  |  |
Developed Technology [Member] | Health Solutions Plus [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Estimated Useful Lives |  | 7 years |  |  |
Finite-Lived Intangible Assets, Gross |  | $ 20 |  |  |
Customer Relationships [Member] | Health Solutions Plus [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Estimated Useful Lives |  | 15 years |  |  |
Finite-Lived Intangible Assets, Gross |  | $ 18 |  |  |
Trademarks and Trade Names [Member] | Health Solutions Plus [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Estimated Useful Lives |  | 1 year 6 months |  |  |
Finite-Lived Intangible Assets, Gross |  | $ 1 |  |  |

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