Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 2,291	$ 1,931	$ 4,492	$ 3,684
Net actuarial losses of defined benefit plans:
Adjustments, net of tax effect of $8 and ($5); $6 and ($7)	(40)	16	(34)	21
Recognized within net income, net of tax effect of ($4) and ($2); ($5) and ($5)	16	8	18	16
Available-for-sale investments:
Unrealized losses, net of tax effect of $1 and $0; $2 and $0	(3)	0	(7)	0
Other comprehensive income (loss), net of taxes	(27)	24	(23)	37
Total comprehensive income	$ 2,264	$ 1,955	$ 4,469	$ 3,721