Defined Severance Benefits (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Retirement Benefits [Abstract]
Current service costs	$ 60	$ 52	$ 120	$ 102
Interest cost	5	4	11	8
Amortization of:
Net actuarial loss	1	3	2	5
Net periodic benefit cost	$ 66	$ 59	$ 133	$ 115