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Investments in equity securities (Detail) - USD ($) $ in Millions | Mar. 31, 2024 | [1] | Dec. 31, 2023 | [2]
--- | --- | --- | --- | ---
Summary of Investment Holdings [Line Items] |  |
Cost Basis | $ 103,753 | $ 109,416
Net Unrealized Gains | 232,111 | 244,426
Fair Value | 335,864 | 353,842
Banks, insurance and finance [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Cost Basis | 28,513 | 27,136
Net Unrealized Gains | 64,299 | 51,176
Fair Value | 92,812 | 78,312
Consumer products [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Cost Basis | 29,214 | 34,248
Net Unrealized Gains | 134,364 | 166,895
Fair Value | 163,578 | 201,143
Commercial, industrial and other [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Cost Basis | 46,026 | 48,032
Net Unrealized Gains | 33,448 | 26,355
Fair Value | $ 79,474 | $ 74,387
[1] | Approximately 75% of the aggregate fair value was concentrated in five companies (American Express Company – $34.5 billion; Apple Inc. – $135.4 billion; Bank of America Corporation – $39.2 billion; The Coca-Cola Company – $24.5 billion and Chevron Corporation – $19.4 billion).
[2] | Approximately 79% of the aggregate fair value was concentrated in five companies (American Express Company – $28.4 billion; Apple Inc. – $174.3 billion; Bank of America Corporation – $34.8 billion; The Coca-Cola Company – $23.6 billion and Chevron Corporation – $18.8 billion).

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