Investments - Information about Investments (Detail) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Investments, Fair Value Disclosure [Abstract]
Equity securities, at fair value	$ 15,359	$ 18,937
Debt instruments, at fair value	14,096	15,558
Available-for-sale securities, at fair value	48,125	48,932
Investments, at fair value	77,580	83,427
Held-to-maturity securities	48,549	4,699
Equity method investments	834	593
Total investments	$ 126,963	$ 88,719

Amount of investment, net of allowance for credit loss, in debt security measured at amortized cost (held-to-maturity).

No definition available.

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- Definition

Total investments at fair value.

+ References

No definition available.

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- Definition

Amount 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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(6))
-URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
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-Section 45
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-URI https://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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-Section 45
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Amount, 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), investment in debt security measured at amortized cost (held-to-maturity), and investment in debt security measured at fair value with change in fair value recognized in net income (trading).

+ References

No definition available.

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- Definition

This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-Publisher FASB
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-Publisher FASB
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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

Sum of the carrying amounts as of the balance sheet date of all investments.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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- References

No definition available.

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