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Investments in equity securities - Narrative (Detail) $ / shares in Units, $ in Billions | 12 Months Ended
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Dec. 31, 2024 USD ($) Company $ / shares shares | Dec. 31, 2023 USD ($) Company
Summary of Investment Holdings [Line Items] |  |
Investment, Type [Extensible Enumeration] | us-gaap:USTreasuryBillSecuritiesMember | us-gaap:USTreasuryBillSecuritiesMember
American Express Company [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Investment owned, common shares outstanding | shares | 151,600,000 |
Investment owned, percent of common shares outstanding | 21.60% |
American Express Company, Apple Inc., Bank of America Corporation, The Coca-Cola Company and Chevron Corporation [Member] | Equity Securities [Member] | Investment Concentration [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Number of holdings in concentration percentage | Company | 5 | 5
Concentration percentage | 71.00% | 79.00%
Occidental Petroleum Corporation [Member] | Investment Commitment [Member] |  |
Summary of Investment Holdings [Line Items] |  |
Investment in preferred stock, stated dividend rate | 8.00% |
Investment in preferred stock, liquidation value | $ | $ 8.5 |
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
Investment, Type [Extensible Enumeration] | Cumulative Perpetual Preferred Stock [Member] | Cumulative Perpetual Preferred Stock [Member]
Number of common shares that can be purchased | shares | 83,860,000 |
Exercise price for warrants, per share | $ / shares | $ 59.62 |
Warrants exercisable period after the date preferred stock is fully redeemed | 1 year |

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