Segment Information - Reportable Segments and Reconciliation to Consolidated Net Income (Details) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) segment	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)
Segment Reporting [Abstract]
Number of operating segments | segment			3
Segment Reporting Disclosure [Line Items]
Net sales	$ 88,912	$ 63,404	$ 164,364	$ 123,104
Operating expenses	83,069	60,320	154,532	115,600
Operating income (loss)	5,843	3,084	9,832	7,504
Total non-operating income (expense)	378	(195)	(228)	(213)
Provision for income taxes	(984)	(257)	(1,729)	(1,094)
Equity-method investment activity, net of tax	6	(7)	(97)	(11)
Net income	5,243	2,625	7,778	6,186	$ 13,180	$ 12,096
North America
Segment Reporting Disclosure [Line Items]
Net sales	55,436	38,653	101,563	74,465
Operating expenses	53,295	37,089	98,111	70,614
Operating income (loss)	2,141	1,564	3,452	3,851
International
Segment Reporting Disclosure [Line Items]
Net sales	22,668	16,370	41,774	32,563
Operating expenses	22,323	16,971	41,826	33,253
Operating income (loss)	345	(601)	(52)	(690)
AWS
Segment Reporting Disclosure [Line Items]
Net sales	10,808	8,381	21,027	16,076
Operating expenses	7,451	6,260	14,595	11,733
Operating income (loss)	$ 3,357	$ 2,121	$ 6,432	$ 4,343