Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 1,127	$ 1,722	$ 2,232	$ 3,430
Net actuarial losses of defined benefit plans:
Adjustments, net of tax effect of ($1) and ($2); ($3) and ($1)	1	2	6	0
Recognized within net income, net of tax effect of ($1) and ($1); ($2) and ($2)	3	3	5	6
Derivative instruments:
Change in fair value, net of tax effect of $0 and ($1); $0 and $0	0	3	1	1
Available-for-sale investments:
Unrealized gains (losses), net of tax effect of $0 and $0; $2 and $0	(1)	(2)	(7)	1
Other comprehensive income (loss), net of taxes	3	6	5	8
Total comprehensive income	$ 1,130	$ 1,728	$ 2,237	$ 3,438