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Supplemental Financial Information - Investments (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2020 | Dec. 31, 2018 | Jun. 30, 2021 | Dec. 31, 2020
Investments |  |  |  |
Long-term Investments |  |  | $ 805 | $ 821
Equity method investments carrying value |  |  | 260 |
Equity investment without readily determinable fair value |  |  | 91 |
Impairment of investments | $ 60 |  |  |
Unrealized gain |  | $ 50 |  |
Equity securities |  |  |  |
Investments |  |  |  |
Long-term Investments |  |  | 754 | 776
Other |  |  |  |
Investments |  |  |  |
Long-term Investments |  |  | 51 | $ 45
St Jude Medical | Equity securities |  |  |  |
Investments |  |  |  |
Securities in mutual funds held in a rabbi trust |  |  | $ 388 |

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