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Summary of carrying value of limited partnerships and commitments to fund (Detail) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023
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Schedule of Carrying Value of Limited Partnerships and Commitments To Fund [Line Items] |  |  |
Limited partnerships, carrying value |  | $ 2,968 | $ 2,821
Off-balance sheet risk |  | 1,529 | 1,530
Limited Partnerships |  |  |
Schedule of Carrying Value of Limited Partnerships and Commitments To Fund [Line Items] |  |  |
Limited partnerships, carrying value |  | 2,314 | 2,193
Assets Measured Using Net Asset Value | Limited Partnerships Private Equity Funds |  |  |
Schedule of Carrying Value of Limited Partnerships and Commitments To Fund [Line Items] |  |  |
Limited partnerships, carrying value | [1] | 2,053 | 1,948
Off-balance sheet risk | [1] | 1,201 | 1,203
Assets Measured Using Net Asset Value | Limited Partnerships Real Estate Funds |  |  |
Schedule of Carrying Value of Limited Partnerships and Commitments To Fund [Line Items] |  |  |
Limited partnerships, carrying value | [2] | 126 | 123
Off-balance sheet risk | [2] | 78 | 87
Assets Measured Using Net Asset Value | Limited Partnerships Infrastructure Funds |  |  |
Schedule of Carrying Value of Limited Partnerships and Commitments To Fund [Line Items] |  |  |
Limited partnerships, carrying value | [3] | 119 | 102
Off-balance sheet risk | [3] | 182 | 160
Assets Measured Using Net Asset Value | Limited Partnerships |  |  |
Schedule of Carrying Value of Limited Partnerships and Commitments To Fund [Line Items] |  |  |
Limited partnerships, carrying value |  | 2,298 | 2,173
Off-balance sheet risk |  | 1,461 | 1,450
Accounted For Under The Equity method of Accounting | Limited Partnerships |  |  |
Schedule of Carrying Value of Limited Partnerships and Commitments To Fund [Line Items] |  |  |
Limited partnerships, carrying value |  | 654 | 628
Off-balance sheet risk |  | 67 | 79
Accounted for at Fair Value | Limited Partnerships |  |  |
Schedule of Carrying Value of Limited Partnerships and Commitments To Fund [Line Items] |  |  |
Limited partnerships, carrying value |  | 16 | 20
Off-balance sheet risk |  | $ 1 | $ 1
[1] | This class employs various investment strategies such as leveraged buyout, growth equity, venture capital and mezzanine financing, generally investing in debt or equity positions directly in companies or assets of various sizes across diverse industries globally, primarily concentrated in North America.
[2] | This class invests in real estate in North America, Europe and Asia via direct property ownership, joint ventures, mortgages and investments in debt and equity instruments.
[3] | This class invests in the debt or equity of cash flow generating assets diversified across a variety of industries, including transportation, energy infrastructure, renewable power, social infrastructure, power generation, water, telecommunications and other regulated entities globally.

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- Definition Limited partnership investments accounted for at fair value when the partnership interest is considered minor or accounted for using the equity method of accounting if the ownership percentage exceeds the minor threshold. + References No definition available. + Details
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- Definition The fair value of financial liabilities, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482907/825-10-50-10 + Details
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