Defined Severance Benefits - Schedule of Components of Net Periodic Costs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Retirement Benefits [Abstract]
Current service costs	$ 220	$ 166	$ 141
Interest cost	17	16	14
Amortization of:
Prior service cost	0	2	3
Net actuarial loss	9	3	1
Net periodic benefit cost	$ 246	$ 187	$ 159