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Strategic Investments (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
Schedule of Investments [Line Items] |  |
Equity method investments | $ 246 | $ 319
Measurement alternative investments(1) | 182 | 183
Equity Securities, FV-NI | 213 | 414
Notes receivable | 2 | 2
Investments | 643 | $ 918
Equity Securities, FV-NI, Gain (Loss) | (146) |
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity | $ 286 |

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