Investments - Fair Value of Investments by Accounting Type (Detail) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Investments, Fair Value Disclosure [Abstract]
Equity securities, at fair value	$ 19,781	$ 22,163
Debt instruments, at fair value	16,981	16,570
Available-for-sale securities, at fair value	46,016	19,094
Investments, at fair value	82,778	57,827
Held-to-maturity securities	5,301	5,825
Equity method investments	366	285
Total investments	$ 88,445	$ 63,937

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 of investment in debt security measured at amortized cost (held-to-maturity), investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale) 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).

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Amount 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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