Segment Information - Reportable Segments and Reconciliation to Consolidated Net Income (Details) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) segment	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)
Segment Reporting [Abstract]
Number of operating segments | segment			3
Segment Reporting Disclosure [Line Items]
Net sales	$ 63,404	$ 52,886	$ 123,104	$ 103,928
Operating expenses	60,320	49,903	115,600	99,017
Operating income (loss)	3,084	2,983	7,504	4,911
Total non-operating income (expense)	(195)	(378)	(213)	(391)
Provision for income taxes	(257)	(74)	(1,094)	(361)
Equity-method investment activity, net of tax	(7)	3	(11)	4
Net income	2,625	2,534	6,186	4,163	$ 12,096	$ 6,275
North America
Segment Reporting Disclosure [Line Items]
Net sales	38,653	32,169	74,465	62,894
Operating expenses	37,089	30,334	70,614	59,910
Operating income (loss)	1,564	1,835	3,851	2,984
International
Segment Reporting Disclosure [Line Items]
Net sales	16,370	14,612	32,563	29,487
Operating expenses	16,971	15,106	33,253	30,603
Operating income (loss)	(601)	(494)	(690)	(1,116)
AWS
Segment Reporting Disclosure [Line Items]
Net sales	8,381	6,105	16,076	11,547
Operating expenses	6,260	4,463	11,733	8,504
Operating income (loss)	$ 2,121	$ 1,642	$ 4,343	$ 3,043