Employee Benefit Plans (Net Periodic Benefit Costs) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 3	$ 3	$ 4
Interest cost	23	23	27
Amortization of prior service cost	(5)	(4)	(7)
Amortization of actuarial losses/(gains)	(1)	(1)	(1)
Settlements, curtailments, and special termination benefits			2
Net periodic benefit cost	20	21	21
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	9	8	7
Interest cost	104	103	111
Expected return on plan assets	105	109	110
Amortization of prior service cost	0	1
Amortization of actuarial losses/(gains)	23	22	21
Settlements, curtailments, and special termination benefits	6	11	192
Net periodic benefit cost	$ 37	$ 36	$ 221