Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 1,105	$ 1,708
Net actuarial losses of defined benefit plans:
Adjustments, net of tax effect of ($2) and $1	5	(2)
Recognized within net income, net of tax effect of ($1) and ($1)	2	3
Derivative instruments:
Change in fair value, net of tax effect of $0 and $1	1	(2)
Available-for-sale investments:
Unrealized gains (losses), net of tax effect of $2 and $0	(6)	3
Other comprehensive income (loss), net of taxes	2	2
Total comprehensive income	$ 1,107	$ 1,710