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Long-duration insurance contracts - Summary of gross premiums earned and net interest expense (Detail) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Periodic Payment Annuity [Member]
Liability for Future Policy Benefit, Activity [Line Items]
Net Interest Expense	$ 273	$ 266
Life and Health [Member]
Liability for Future Policy Benefit, Activity [Line Items]
Gross Premiums	1,870	1,644
Net Interest Expense	$ 68	$ 107

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