Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 2,295	$ 1,947	$ 6,787	$ 5,631
Net actuarial losses of defined benefit plans:
Adjustments, net of tax effect of ($4) and ($1); $2 and ($8)	11	3	(23)	24
Recognized within net income, net of tax effect of ($4) and ($2); ($9) and ($7)	15	8	33	24
Prior service credit of defined benefit plans:
Adjustments, net of tax effect of $0 and $0; $0 and $0	1	0	1	0
Recognized within net income, net of tax effect of $0 and $0; $0 and $0	(1)	(1)	(1)	(1)
Derivative instruments:
Change in fair value, net of tax effect of $0 and $0; $0 and $0	1	0	1	0
Available-for-sale investments:
Unrealized losses, net of tax effect of $0 and $0; $2 and $0	(1)	0	(8)	0
Other comprehensive income (loss), net of taxes	26	10	3	47
Total comprehensive income	$ 2,321	$ 1,957	$ 6,790	$ 5,678