Employee Benefit Plans (Net Periodic Benefit Costs) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 3	$ 4	$ 8
Interest cost	23	27	16
Amortization of prior service cost	(4)	(7)	(11)
Amortization of actuarial losses/(gains)	(1)	(1)	12
Settlements, curtailments, and special termination benefits		2
Net periodic benefit cost/(income)	21	21	25
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	8	7	9
Interest cost	103	111	73
Expected return on plan assets	109	110	140
Amortization of prior service cost	1
Amortization of actuarial losses/(gains)	22	21	34
Settlements, curtailments, and special termination benefits	11	192	6
Net periodic benefit cost/(income)	$ 36	$ 221	$ (18)