Condensed Consolidated Statement of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Statement of Cash Flows [Abstract]
Net Income from operations	$ 4,856	$ 4,434
Adjustments to reconcile income from continuing operations to net cash flows provided by operating activities of continuing operations:
Depreciation and amortization	1,766	1,582
Deferred income tax provision	70	724
Stock compensation cost	181	145
Gain on sale of Taylor Company	799	0
Change in:
Accounts receivable	2,379	1,051
Contract assets, current	892	0
Inventories and contracts in progress	991	1,249
Other current assets	(262)	(78)
Accounts payable and accrued liabilities	3,044	1,864
Contract liabilities, current	313	0
Global pension contributions	72	2,008
Canadian Government Settlement	(221)	(246)
Other operating activities, net	821	1,163
Net cash flows provided by operating activities of continuing operations	4,317	3,110
Investing Activities of Continuing Operations:
Capital expenditures	1,122	1,214
Investments in businesses	177	196
Dispositions of businesses	1,099	37
Proceeds from the sale of the investment in Watsco Inc.	0	596
Increase in customer financing assets	453	525
Increase in collaboration intangible assets	302	290
Payments (receipts) from settlements of derivative contracts	(71)	183
Other investing activities, net	135	(117)
Net cash flows used in investing activities of continuing operations	(1,019)	(1,658)
Financing Activities of Continuing Operations:
Proceeds from Issuance of Long-term Debt	13,409	4,044
Repayments of Long-term Debt	2,093	1,587
Increase in short-term borrowings, net	1,228	400
Proceeds from Common Stock issued under employee stock plans	33	25
Dividends paid on Common Stock	1,606	1,541
Repurchase of Common Stock	72	1,430
Other financing activities, net	(60)	(204)
Net cash flows provided by (used in) financing activities of continuing operations	10,839	(293)
Effect of Exchange Rate on Cash and Cash Equivalents [Abstract]
Effect of foreign exchange rate changes on cash and cash equivalents	(111)	208
Net increase in cash and cash equivalents	14,026	1,367
Cash and Cash Equivalents, beginning of year	9,018	7,189
Cash and Cash Equivalents, end of period	23,044	8,556
Restricted Cash	9,245	33
Cash and cash equivalents, end of period	$ 13,799	$ 8,523