Investments - Fair Value of Investments by Accounting Type (Detail) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Investments, Fair Value Disclosure [Abstract]
Equity securities, at fair value	$ 18,937	$ 19,781
Debt instruments, at fair value	15,558	16,981
Available-for-sale securities, at fair value	48,932	46,016
Investments, at fair value	83,427	82,778
Held-to-maturity securities	4,699	5,301
Equity method investments	593	366
Total investments	$ 88,719	$ 88,445

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 http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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-Section 45
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- Definition

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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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=123594786&loc=SL75136599-209740

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- Definition

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

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- References

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