Employee Benefit Plans (Change in Accumulated Other Comprehensive Loss (Pretax) Relating to Defined Benefit Pension and Other Postretirement Benefits) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss arising during the year	$ 0
Plan amendment	17
Amortization of actuarial loss/(gain)	(1)	$ 12	$ 20
Amortization of prior service credit	7	11	54
Foreign currency translation adjustments	0
Impact of settlements	0
Net decrease	(9)
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Net actuarial loss arising during the year	141
Plan amendment	0
Amortization of actuarial loss/(gain)	21	$ 34	$ 39
Amortization of prior service credit	0
Foreign currency translation adjustments	8
Impact of settlements	(194)
Net decrease	$ (66)