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Acquisitions and Divestitures - Liabilities Assumed from Acquisition of Businesses (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Business Combinations [Abstract] |  |  |
Fair value of assets acquired | $ 110 | $ 857 | $ 83
Cash and stock consideration (net of cash acquired) | 91 | 803 | 83
Liabilities assumed | $ 19 | $ 54 | $ 0

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