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Investments (Equity Securities) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Equity securities | $ 767 |  | $ 767 |  | $ 831
Equity Securities, FV-NI, Unrealized Gain (Loss) | 17 | $ 135 | (259) | $ 104 |
Equity securities without readily determinable fair value | 227 |  | 227 |  | 262
Equity Securities without Readily Determinable Fair Value, Downward Price Adjustment, Annual Amount | 55 |  | 64 |  |
Fair Value, Inputs, Level 1 |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Equity securities | $ 385 |  | $ 385 |  | $ 611

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