Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 4,799	$ 6,510	$ 8,749
Net actuarial losses of defined benefit plans:
Adjustments, net of tax effect of ($20), ($9) and $48	53	27	(155)
Recognized within net income, net of tax effect of ($3), ($5) and ($17)	10	15	61
Prior service cost (credit) of defined benefit plans:
Recognized within net income, net of tax effect of $0, $0 and $0	1	1	(1)
Derivative instruments:
Change in fair value, net of tax effect of $0, $0 and $0	1	1	1
Available-for-sale investments:
Unrealized gains (losses), net of tax effect of $0, ($1) and $1	0	5	(3)
Other comprehensive income (loss), net of taxes	65	49	(97)
Total comprehensive income	$ 4,864	$ 6,559	$ 8,652