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Stockholders' equity - Schedule of Changes in Stockholders' Equity (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning			$ 9,187				$ 9,187
Net income	$ 1,947			$ 1,353			5,631	$ 3,907
Other comprehensive income (loss), net of taxes	10			(1)			47	12
Balance, ending	12,151						12,151
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning	1,741	$ 1,741	1,741	1,741	$ 1,741	$ 1,741	1,741	1,741
Balance, ending	1,741	1,741	1,741	1,741	1,741	1,741	1,741	1,741
Paid-in Capital
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning	2,485	2,391	2,333	2,182	2,096	2,110	2,333	2,110
Common stock issued for stock-based awards	27	25	(3)	26	17	(77)
Stock compensation	50	69	61	50	69	63
Other	1			(1)
Balance, ending	2,563	2,485	2,391	2,257	2,182	2,096	2,563	2,257
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning	43,846	42,860	42,051	40,780	40,227	39,898	42,051	39,898
Net income	1,947	1,931	1,753	1,353	1,380	1,174
Dividends declared and paid	(942)	(942)	(940)	(825)	(823)	(841)
Dividend equivalents on RSUs	(3)	(4)	(4)	(3)	(4)	(4)
Other	(1)	1
Balance, ending	44,847	43,846	42,860	41,305	40,780	40,227	44,847	41,305
Treasury Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning	(36,596)	(36,479)	(36,578)	(36,725)	(36,002)	(34,495)	(36,578)	(34,495)
Common stock issued for stock-based awards	48	29	199	97	70	223
Stock repurchases	(139)	(146)	(100)	(15)	(793)	(1,730)
Balance, ending	(36,687)	(36,596)	(36,479)	(36,643)	(36,725)	(36,002)	(36,687)	(36,643)
AOCI
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Balance, beginning	(323)	(347)	(360)	(334)	(328)	(347)	(360)	(347)
Other comprehensive income (loss), net of taxes	10	24	13	(1)	(6)	19
Balance, ending	$ (313)	$ (323)	$ (347)	$ (335)	$ (334)	$ (328)	$ (313)	$ (335)

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