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Investments in equity securities (Parenthetical) (Detail) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 USD ($) Company | Dec. 31, 2023 USD ($) Company
Summary of Investment Holdings [Line Items] |  |  |  |
Equity Securities, Fv-Ni | $ 335,864 | [1] | $ 353,842 | [2]
American Express Company [Member] |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Equity Securities, Fv-Ni | 34,500 |  | 28,400 |
Apple Inc. [Member] |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Equity Securities, Fv-Ni | 135,400 |  | 174,300 |
Bank of America Corporation [Member] |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Equity Securities, Fv-Ni | 39,200 |  | 34,800 |
Coca Cola Company [Member] |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Equity Securities, Fv-Ni | 24,500 |  | 23,600 |
Chevron Corporation [Member] |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Equity Securities, Fv-Ni | $ 19,400 |  | $ 18,800 |
Equity Securities [Member] | American Express Company, Apple Inc., Bank of America Corporation, The Coca-Cola Company and Chevron Corporation [Member] | Investment Concentration [Member] |  |  |  |
Summary of Investment Holdings [Line Items] |  |  |  |
Concentration percentage | 75.00% |  | 79.00% |
Number of companies in concentration percentage | Company | 5 |  | 5 |
[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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