Condensed Consolidated Statement of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Statement of Cash Flows [Abstract]
Net income from Continuing Operations	$ 1,468	$ 1,253
Adjustments to reconcile income from continuing operations to net cash flows provided by operating activities of continuing operations:
Depreciation and amortization	512	466
Deferred income tax provision	109	145
Stock compensation cost	47	48
Change in:
Accounts receivable	268	110
Inventories and contracts in progress	654	310
Other current assets	21	81
Accounts payable and accrued liabilities	468	(130)
Global pension contributions	46	75
Canadian Government Settlement	(246)	(237)
Other operating activities, net	376	171
Net cash flows provided by operating activities of continuing operations	993	798
Investing Activities of Continuing Operations:
Capital expenditures	325	286
Investments in businesses	95	79
Dispositions of businesses	5
Dispositions of businesses		16
Proceeds from the sale of the investment in Watsco Inc.	596	0
(Increase) in customer financing assets	147
Decrease in customer financing assets		13
Increase in collaboration intangible assets	101	98
(Payments) receipts from settlements of derivative contracts	113	(42)
Other investing activities, net	(51)	101
Net cash flows used in investing activities of continuing operations	(139)	(493)
Financing Activities of Continuing Operations:
(Repayment) issuance of long-term debt, net	(27)	2,324
Increase in short-term borrowings, net	567	306
Proceeds from Common Stock issued under employee stock plans	11	2
Dividends paid on Common Stock	505	509
Repurchase of Common Stock	933	0
Other financing activities, net	(42)	(93)
Net cash flows (used in) provided by financing activities of continuing operations	(929)	2,030
Discontinued Operations:
Net cash flows used in operating activities of discontinued operations	0	(2,227)
Effect of Exchange Rate on Cash and Cash Equivalents [Abstract]
Effect of foreign exchange rate changes on cash and cash equivalents	69	17
Net (decrease) increase in cash and cash equivalents	(6)	125
Cash and Cash Equivalents, beginning of year	7,189	7,120
Cash and Cash Equivalents, end of period	7,183	7,245
Less: Cash and cash equivalents of businesses held for sale	27	30
Cash and cash equivalents, end of period	$ 7,156	$ 7,215