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Business Combinations and Divestitures Zynstra Details (Details) - Zynstra Ltd. [Member] $ in Millions | 12 Months Ended
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Dec. 31, 2019 USD ($)
Business Acquisition [Line Items] |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net | $ 134
Business Combination, Cash Consideration Paid | 112
Business Combination, Contingent Consideration, Liability, Current | 22
Business Acquisition, Transaction Costs | $ 2

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