Business Developments and Risks and Uncertainties (Schedule of Discontinued Operations Components of Assets and Liabilities Held for Sale) (Detail) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Assets held for sale
Cash	$ 1	$ 12
Accounts receivable	17	24
Goodwill	90	90
Other assets	9	8
Loss on disposal group	(44)	(54)
Total assets held for sale	73	80
Liabilities held for sale
Accounts payable	7	12
Debt	39	30
Accrued expenses and other	18	19
Total liabilities held for sale	$ 64	$ 61