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Investments - Amortized Cost, Gross Unrealized Gains & Losses, and Fair Value of Interest-bearing Securities (Details) - USD ($) $ in Millions | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Marketable Securities [Line Items] |  |
Amortized cost | $ 33,618 | $ 4,335
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Fair values | 33,618 | 4,335
U.S. Treasury bills |  |
Marketable Securities [Line Items] |  |
Amortized cost | 0 | 1,676
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Fair values | 0 | 1,676
Money market mutual funds |  |
Marketable Securities [Line Items] |  |
Amortized cost | 33,618 | 2,659
Gross unrealized gains | 0 | 0
Gross unrealized losses | 0 | 0
Fair values | $ 33,618 | $ 2,659

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