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Investments (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Investments |  |  |
Fair Value | $ 1,416 | $ 1,465 |
Long term investments | 156 | 87 |
Change in unrealized gains (losses) on trading securities | 12 | 74 | $ 176
Domestic debt securities |  |  |
Investments |  |  |
Fair Value | 542 | 496 |
Domestic equity securities |  |  |
Investments |  |  |
Fair Value | 472 | 702 |
Foreign equity securities |  |  |
Investments |  |  |
Fair Value | 193 | 133 |
Foreign debt securities |  |  |
Investments |  |  |
Fair Value | 133 | 68 |
Foreign debt securities | Denominated in Euros |  |  |
Investments |  |  |
Fair Value | 46 | 29 |
Money market funds held in trading accounts |  |  |
Investments |  |  |
Fair Value | 59 | 47 |
Other trading investments |  |  |
Investments |  |  |
Fair Value | $ 17 | $ 19 |

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