Business Developments and Risks and Uncertainties (Schedule of Discontinued Operations Components of Assets and Liabilities Held for Sale) (Detail) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Assets held for sale
Cash	$ 1	$ 12
Accounts receivable	18	24
Goodwill	90	90
Other assets	11	8
Loss on disposal group	(46)	(54)
Total assets held for sale	74	80
Liabilities held for sale
Accounts payable	8	12
Debt	37	30
Accrued expenses and other	20	19
Total liabilities held for sale	$ 65	$ 61