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Investments - Amortized Cost, Gross Unrealized Gains & Losses, and Fair Value of Interest-bearing Securities (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Marketable Securities [Line Items]
Amortized cost	$ 34,208	$ 4,335
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Fair values	34,208	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	34,208	2,659
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Fair values	$ 34,208	$ 2,659

X

- 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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
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-Publisher FASB
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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(1))
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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-Publisher FASB
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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (aa)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-2

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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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-SubTopic 210
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-Paragraph 1
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