Leases (Narrative) (Detail) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Lessee, Lease, Description [Line Items]
Lease expense		$ 55	$ 59	$ 57
Operating lease, cost		34	36	38
Variable lease, cost		21	23	19
Operating lease, payments		38	42	44
Right-of-use asset obtained in exchange for operating lease liability		28	$ 20	$ 11
Assets disposed of by method other than sale, in period of disposition, gain (loss) on disposition	$ 24
Lessee, operating lease, lease not yet commenced, liability	$ 12	$ 12
Maximum
Lessee, Lease, Description [Line Items]
Lessee, operating lease, lease not yet commenced, term of contract	10 years	10 years
Minimum
Lessee, Lease, Description [Line Items]
Lessee, operating lease, lease not yet commenced, term of contract	3 years	3 years