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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
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.