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Other Investments (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2021 | Mar. 31, 2021 | Dec. 31, 2021 | Dec. 31, 2020
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Annual Amount |  |  | $ 101 |
Equity Securities without Readily Determinable Fair Value, Amount | $ 900 |  | 900 | $ 1,700
Equity Securities without Readily Determinable Fair Value, Amount | 900 |  | 900 | 1,700
Equity Securities |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Marketable Securities, Unrealized Gain (Loss) |  |  | $ 8,300 | $ 24
Equity Securities | Rivian |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Marketable Securities, Unrealized Gain (Loss) | $ 8,200 |  |  |
Other Income [Member] |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |
Equity Securities without Readily Determinable Fair Value, Upward Price Adjustment, Annual Amount |  | $ 902 |  |

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