Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 5,001	$ 4,799	$ 6,510
Net actuarial losses of defined benefit plans:
Adjustments	59	53	27
Recognized within net income	14	10	15
Prior service cost (credit) of defined benefit plans:
Adjustments	(18)	0	0
Recognized within net income	1	1	1
Available-for-sale investments and other:
Adjustments	(1)	1	6
Other comprehensive income (loss)	55	65	49
Total comprehensive income	$ 5,056	$ 4,864	$ 6,559