Investments - Schedule of Investments by Major Security Type (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Short-term investments
Debt securities, amortized cost	$ 2,324
Debt securities, total estimated fair value	2,300
Total short-term investments	2,787	$ 2,244
Long-term investments:
Debt securities, amortized cost	2,324
Debt securities, total estimated fair value	2,300
Short-term investments
Short-term investments
Debt securities, amortized cost	2,311	2,232
Debt securities, gross unrealized gains	1	1
Debt securities, gross unrealized losses	(16)	(10)
Debt securities, total estimated fair value	2,296	2,223
Time deposits	490	20
Equity investments	1	1
Amortized Cost	2,802	2,253
Total short-term investments	2,787	2,244
Long-term investments:
Debt securities, amortized cost	2,311	2,232
Debt securities, gross unrealized gains	1	1
Debt securities, gross unrealized losses	(16)	(10)
Debt securities, total estimated fair value	2,296	2,223
Short-term investments \| Certificates of deposit
Short-term investments
Debt securities, amortized cost	328	573
Debt securities, gross unrealized gains	0	0
Debt securities, gross unrealized losses	0	0
Debt securities, total estimated fair value	328	573
Long-term investments:
Debt securities, amortized cost	328	573
Debt securities, gross unrealized gains	0	0
Debt securities, gross unrealized losses	0	0
Debt securities, total estimated fair value	328	573
Short-term investments \| Government bonds
Short-term investments
Debt securities, amortized cost	291	83
Debt securities, gross unrealized gains	0	0
Debt securities, gross unrealized losses	0	0
Debt securities, total estimated fair value	291	83
Long-term investments:
Debt securities, amortized cost	291	83
Debt securities, gross unrealized gains	0	0
Debt securities, gross unrealized losses	0	0
Debt securities, total estimated fair value	291	83
Short-term investments \| Commercial paper
Short-term investments
Debt securities, amortized cost	366	574
Debt securities, gross unrealized gains	0	0
Debt securities, gross unrealized losses	0	0
Debt securities, total estimated fair value	366	574
Long-term investments:
Debt securities, amortized cost	366	574
Debt securities, gross unrealized gains	0	0
Debt securities, gross unrealized losses	0	0
Debt securities, total estimated fair value	366	574
Short-term investments \| Corporate debt securities
Short-term investments
Debt securities, amortized cost	1,209	965
Debt securities, gross unrealized gains	1	1
Debt securities, gross unrealized losses	(10)	(7)
Debt securities, total estimated fair value	1,200	959
Long-term investments:
Debt securities, amortized cost	1,209	965
Debt securities, gross unrealized gains	1	1
Debt securities, gross unrealized losses	(10)	(7)
Debt securities, total estimated fair value	1,200	959
Short-term investments \| Mortgage-backed and asset-backed securities
Short-term investments
Debt securities, amortized cost	117	37
Debt securities, gross unrealized gains	0	0
Debt securities, gross unrealized losses	(6)	(3)
Debt securities, total estimated fair value	111	34
Long-term investments:
Debt securities, amortized cost	117	37
Debt securities, gross unrealized gains	0	0
Debt securities, gross unrealized losses	(6)	(3)
Debt securities, total estimated fair value	111	34
Long-term investments \| Corporate debt securities
Short-term investments
Debt securities, amortized cost	13	13
Debt securities, gross unrealized gains	0	0
Debt securities, gross unrealized losses	(9)	(9)
Debt securities, total estimated fair value	4	4
Long-term investments:
Debt securities, amortized cost	13	13
Debt securities, gross unrealized gains	0	0
Debt securities, gross unrealized losses	(9)	(9)
Debt securities, total estimated fair value	$ 4	$ 4

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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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-Topic 320
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Amount, before tax, of unrealized loss 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).

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Amortized cost excluding accrued interest, after allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as current.

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Amount of investments including trading securities, available-for-sale securities, held-to-maturity securities, and short-term investments classified as other and current.

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Any certificate of deposit or savings account held by a bank or other financial institution for a short-term specified period of time. Because of their short-term, time deposits are considered highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

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