Condensed Consolidated Statement of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Cash Flows [Abstract]
Net Income from continuing operations	$ 1,368	$ 1,468
Adjustments to reconcile income from continuing operations to net cash flows provided by operating activities of continuing operations:
Depreciation and amortization	581	512
Deferred income tax provision	42	109
Stock compensation cost	55	47
Change in:
Accounts receivable	1,140	268
Contract asset, current	417	0
Inventories and contracts in progress	631	654
Other current assets	12	21
Accounts payable and accrued liabilities	576	468
Contract liabilities, current	652	0
Global pension contributions	37	46
Canadian Government Settlement	(221)	(246)
Other operating activities, net	363	376
Net cash flows provided by operating activities of continuing operations	453	993
Investing Activities of Continuing Operations:
Capital expenditures	337	325
Investments in businesses	125	95
Dispositions of businesses	35
Payments for (Proceeds from) Businesses and Interest in Affiliates		5
Proceeds from the sale of the investment in Watsco Inc.	0	596
Increase in customer financing assets	241	147
Increase in collaboration intangible assets	78	101
Payments for settlements of derivative contracts	221	113
Other investing activities, net	9	(51)
Net cash flows used in investing activities of continuing operations	(976)	(139)
Financing Activities of Continuing Operations:
Proceeds from Issuance of Long-term Debt	18	12
Repayments of Long-term Debt	993	39
Increase (decrease) in short-term borrowings, net	666	567
Proceeds from Common Stock issued under employee stock plans	5	11
Dividends paid on Common Stock	535	505
Repurchase of Common Stock	25	933
Other financing activities, net	(46)	(42)
Net cash flows used in financing activities of continuing operations	(910)	(929)
Effect of Exchange Rate on Cash and Cash Equivalents [Abstract]
Effect of foreign exchange rate changes on cash and cash equivalents	119	69
Net (decrease) in cash and cash equivalents	(1,314)	(6)
Cash and Cash Equivalents, beginning of year	9,018	7,189
Cash and Cash Equivalents, end of period	7,704	7,183
Restricted Cash	37	27
Cash and cash equivalents, end of period	$ 7,667	$ 7,156