Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Statement of Comprehensive Income [Abstract]
Net income	$ 1,545	$ 1,179
Net actuarial losses of defined benefit plans:
Adjustments	1	(7)
Recognized within net income	0	2
Prior service cost (credit) of defined benefit plans:
Adjustments	1	0
Recognized within net income	1	0
Available-for-sale investments and other:
Adjustments	(2)	(2)
Other comprehensive income (loss)	1	(7)
Total comprehensive income	$ 1,546	$ 1,172