Defined Severance Benefits (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Retirement Benefits [Abstract]
Current service costs	$ 50	$ 40
Interest cost	4	4
Amortization of:
Net actuarial loss	2	1
Net periodic benefit cost	$ 56	$ 45