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Investments - Information about Investments (Detail) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Investments, Fair Value Disclosure [Abstract]
Available-for-sale securities, at fair value	$ 103,962	$ 79,458
Held-to-maturity securities	73,632	78,713
Equity securities, at fair value	14,114	13,832
Debt instruments, at fair value	11,100	11,452
Equity-method investments	949	1,059
Total other investments	26,163	26,343
Total investments	$ 203,757	$ 184,514

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