Investments - Fair Value of Investments by Accounting Type (Detail) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Investments, Fair Value Disclosure [Abstract]
Equity securities, at fair value	$ 22,163	$ 21,430
Debt instruments, at fair value	16,570	12,117
Available-for-sale securities, at fair value	19,094	12,032
Investments, at fair value	57,827	45,579
Held-to-maturity securities	5,825	1,288
Equity method investments	285	357
Total investments	$ 63,937	$ 47,224

Investments In debt securities.

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

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-Publisher FASB
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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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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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- Definition

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

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- References

No definition available.

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Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading).

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