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Investments (Equity Securities) (Details Textual) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Equity securities | $ 492 |  | $ 492 |  | $ 831
Equity Securities, FV-NI, Unrealized Gain (Loss) | (106) | $ 25 | (276) | $ (31) |
Equity securities without readily determinable fair value | 280 |  | 280 |  | 262
Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Equity securities | $ 361 |  | $ 361 |  | $ 611

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