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Investments - Equity Securities (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Equity securities | $ 831 | $ 477 |
Equity Securities, FV-NI, Unrealized Gain (Loss) | 161 | 174 | $ 112
Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Annual Amount | 152 |  |
Equity Securities, Realized Gain (Loss) on Disposal | 41 |  |
Other Noncurrent Assets |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Equity securities | 611 | 477 |
Equity securities without readily determinable fair value | $ 262 | $ 203 |

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