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Acquisitions and Divestitures - Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Millions | Feb. 14, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |
Goodwill |  | $ 2,521 | $ 2,566 | $ 2,344
Alpha Holding Company, LLC |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Property and equipment | $ 299 |  |  |
Intangible assets | 646 |  |  |
Goodwill | 269 |  |  |
Other assets and liabilities, net (including $4 million of cash acquired) | 1 |  |  |
Identifiable assets acquired and liabilities assumed | $ 1,215 |  |  |
Weighted-average useful life | 20 years |  |  |
Cash acquired | $ 4 |  |  |
Minimum | Alpha Holding Company, LLC |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Estimated useful lives | 3 years |  |  |
Maximum | Alpha Holding Company, LLC |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Estimated useful lives | 70 years |  |  |

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