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Acquisitions and Strategic Investments Strategic Investments (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Schedule of Equity Method Investments [Line Items] |  |
Equity Method Investments | $ 264 | $ 303
Cost Method Investments | 171 | 94
Available-for-sale Securities | 1 | 0
Notes Receivable From Portfolio Companies | 23 | 26
Investments | 458 | $ 424
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity | $ 314 |

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