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Changes In Accumulated Other Comprehensive Income (Loss) - Additional Information (Detail) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Postretirement benefit obligations, current period OCI $ 30 $ 34
Postretirement benefit obligations, current period OCI, tax (8) (9)
Foreign currency translation and other adjustments, current period OCI, tax 1 1
Change in the discount rate used to measure future policy benefits, current period OCI, tax (169) 255
Change in instrument-specific credit risk of MRBs, current period OCI, tax $ 1 $ 2