Employee Benefit Plans (Net Periodic Benefit Costs) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 8	$ 12	$ 10
Interest cost	16	14	20
Amortization of prior service credit	(11)	(54)	(59)
Amortization of actuarial losses	12	20	15
Net periodic benefit (income)/cost	25	(8)	(14)
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	9	9	24
Interest cost	73	65	87
Expected return on plan assets	140	152	144
Amortization of prior service credit	0
Amortization of actuarial losses	34	39	71
Settlements, curtailments, and special termination benefits	6	53	18
Net periodic benefit (income)/cost	$ (18)	$ 14	$ 56