Defined Severance Benefits (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Retirement Benefits [Abstract]
Current service costs	$ 56	$ 43	$ 158	$ 123
Interest cost	4	3	12	11
Amortization of:
Prior service cost	0	1	0	2
Net actuarial loss	2	1	7	2
Net periodic benefit cost	$ 62	$ 48	$ 177	$ 138