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Investments - Amortized Cost, Gross Unrealized Gains & Losses, and Fair Value of Interest-bearing Securities (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Amortized cost	$ 31,065	$ 4,335
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Fair values	31,065	4,335
U.S. Treasury bills
Debt Securities, Available-for-sale [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
Debt Securities, Available-for-sale [Line Items]
Amortized cost	31,064	2,659
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Fair values	31,064	2,659
Other short-term interest-bearing securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost	1	0
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Fair values	$ 1	$ 0

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- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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