Revenue Recognition - Transition Disclosures, Statement of Earnings (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017		Jun. 30, 2018	Jun. 30, 2017
Transition Disclosures
Revenue	$ 20,003	$ 19,289		$ 39,075	$ 37,443
Cost	10,804	10,321	[1]	21,629	20,531	[1]
Gross profit	9,199	8,968	[1]	17,445	16,912	[1]
Selling, general and administrative	4,857	5,033	[1]	10,302	10,060	[1]
Income from continuing operations before income taxes	2,776	2,443		3,911	3,867
Provision for/(benefit from) income taxes	373	111		(166)	(218)
Net income	$ 2,404	$ 2,331		$ 4,083	$ 4,082
Earnings/(loss) per share of common stock:
Assuming dilution (in dollars per share)	$ 2.61	$ 2.48		$ 4.42	$ 4.32
Basic (in dollars per share)	$ 2.63	$ 2.49		$ 4.44	$ 4.35
Accounting Standards Update 2014-09, Revenue from Contracts with Customers | Adjustments to convert to prior GAAP
Transition Disclosures
Revenue	$ 38			$ (14)
Cost	24			0
Gross profit	14			(14)
Selling, general and administrative	17			(4)
Income from continuing operations before income taxes	(3)			(10)
Provision for/(benefit from) income taxes	(1)			(3)
Net income	$ (2)			$ (7)
Earnings/(loss) per share of common stock:
Assuming dilution (in dollars per share)	$ 0.00			$ (0.01)
Basic (in dollars per share)	$ 0.00			$ (0.01)
Accounting Standards Update 2014-09, Revenue from Contracts with Customers | Adjusted amounts under prior GAAP
Transition Disclosures
Revenue	$ 20,041			$ 39,061
Cost	10,829			21,629
Gross profit	9,212			17,432
Selling, general and administrative	4,874			10,298
Income from continuing operations before income taxes	2,773			3,901
Provision for/(benefit from) income taxes	372			(170)
Net income	$ 2,402			$ 4,076
Earnings/(loss) per share of common stock:
Assuming dilution (in dollars per share)	$ 2.61			$ 4.41
Basic (in dollars per share)	$ 2.63			$ 4.43

[1] Recast to reflect adoption of the FASB guidance on presentation of net periodic pension and nonpension postretirement benefit costs.