Investments - Fair Value of Investments by Accounting Type (Detail) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Investments, Fair Value Disclosure [Abstract]
Equity securities, at fair value	$ 19,339	$ 19,781
Debt instruments, at fair value	17,045	16,981
Available-for-sale securities, at fair value	44,585	46,016
Investments, at fair value	80,969	82,778
Held-to-maturity securities	5,205	5,301
Equity method investments	534	366
Total investments	$ 86,708	$ 88,445

Total investments at fair value.

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Amount 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, 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).

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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.

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

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

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