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Investments in equity securities - Narrative (Detail) - USD ($) $ / shares in Units, $ in Billions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2024 | Aug. 04, 2022 | Dec. 31, 2019
American Express Company [Member] |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Investment owned, common shares outstanding | 151,600,000 |  |
Investment owned, percent of common shares outstanding | 21.10% |  |
Occidental Petroleum Corporation [Member] | Investment Commitment [Member] |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Number of common shares that can be purchased | 83,860,000 |  |
Exercise price for warrants, per share | $ 59.62 |  |
Warrants exercisable period after the date preferred stock is fully redeemed | 1 year |  |
Occidental Petroleum Corporation [Member] | Occidental Common Stock [Member] | Minimum [Member] |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Equity method investment ownership percentage |  | 20.00% |
Occidental Petroleum Corporation [Member] | Cumulative Perpetual Preferred Stock [Member] | Investment Commitment [Member] |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Investment in preferred stock, liquidation value | $ 8.5 |  |
Investment in preferred stock, stated dividend rate | 8.00% |  |
Investment in preferred stock, redemption year start | 2029 |  |
Investment in preferred stock, redemption price percentage of liquidation value | 105.00% |  |
Liquidation value of mandatory redemption notifications | $ 1.5 |  |
Occidental Petroleum Corporation [Member] | Cumulative Perpetual Preferred Stock and Warrants [Member] | Investment Commitment [Member] |  |  |
Summary of Investment Holdings [Line Items] |  |  |
Investment commitment amount |  |  | $ 10.0

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