Condensed Consolidated Statement of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Statement of Cash Flows [Abstract]
Net income from Continuing Operations	$ 4,434	$ 4,312
Adjustments to reconcile income from continuing operations to net cash flows provided by operating activities of continuing operations:
Depreciation and amortization	1,582	1,456
Deferred income tax provision	724	273
Stock compensation cost	145	112
Change in:
Accounts receivable	1,051	636
Inventories and contracts in progress	1,249	810
Other current assets	(78)	27
Accounts payable and accrued liabilities	1,864	774
Global pension contributions	(2,008)	(125)
Canadian Government Settlement	(246)	(237)
Other operating activities, net	1,163	525
Net cash flows provided by operating activities of continuing operations	3,110	4,567
Investing Activities of Continuing Operations:
Capital expenditures	1,214	1,043
Investments in businesses	196	535
Dispositions of businesses	37	148
Proceeds from the sale of the investment in Watsco Inc.	596	0
Increase in customer financing assets	525	128
Increase in collaboration intangible assets	290	301
Payments for settlements of derivative contracts	183	29
Other investing activities, net	(117)	11
Net cash flows used in investing activities of continuing operations	(1,658)	(1,899)
Financing Activities of Continuing Operations:
Proceeds from Issuance of Long-term Debt	4,044	2,482
Repayments of Long-term Debt	1,587	201
Increase (decrease) in short-term borrowings, net	400	(63)
Proceeds from Common Stock issued under employee stock plans	25	6
Dividends paid on Common Stock	1,541	1,561
Repurchase of Common Stock	1,430	528
Other financing activities, net	(204)	(338)
Net cash flows used in financing activities of continuing operations	(293)	(203)
Discontinued Operations:
Net cash flows used in operating activities of discontinued operations	0	(2,480)
Cash Provided by (Used in) Operating Activities, Discontinued Operations	0	(2,486)
Net cash provided by investing activities of discontinued operations	0	6
Effect of Exchange Rate on Cash and Cash Equivalents [Abstract]
Effect of foreign exchange rate changes on cash and cash equivalents	208	28
Net increase in cash and cash equivalents	1,367	13
Cash and Cash Equivalents, beginning of year	7,189	7,120
Cash and Cash Equivalents, end of period	8,556	7,133
Restricted Cash	33	26
Cash and cash equivalents, end of period	$ 8,523	$ 7,107