Impact of Adoption of New Standards Impact of Adoption of New Standards (Schedule of Accounting Changes) (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended		6 Months Ended		12 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017	Dec. 31, 2016	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2015
Income Statement [Abstract]
Sales of products		$ 21,565	$ 20,518	$ 42,385	$ 39,885
Sales of services		2,693	2,533	5,255	5,127
Revenues		24,258	23,051	47,640	45,012
Cost of Goods Sold		(17,436)	(16,824)	(34,252)	(32,886)
Cost of Services		(2,083)	(1,865)	(4,075)	(3,863)
Financial Services Costs		(17)	(13)	(33)	(26)
Cost of Revenue		(19,536)	(18,702)	(38,360)	(36,775)
Gross Profit		4,722	4,349	9,280	8,237
Income from operating investments, net		6	39	80	120
General and Administrative Expense		(1,194)	(1,043)	(2,191)	(1,972)
Research and Development Expense		(827)	(813)	(1,591)	(1,649)
(Gain)/Loss on dispositions, net		(3)	2	(7)
Earnings from operations		2,710	2,530	5,585	4,736
Other income, net		(15)	25	51	51
Interest and Debt Expense		(109)	(93)	(211)	(180)
Earnings before income taxes		2,586	2,462	5,425	4,607
Income tax expense		(390)	(713)	(752)	(1,279)
Net earnings		$ 2,196	$ 1,749	$ 4,673	$ 3,328
Earnings Per Share, Basic		$ 3.77	$ 2.91	$ 7.97	$ 5.47
Earnings Per Share, Diluted		$ 3.73	$ 2.87	$ 7.88	$ 5.41
Assets [Abstract]
Cash and cash equivalents		$ 8,121	$ 8,737	$ 8,121	$ 8,737	$ 8,813
Short-term and other investments		1,649		1,649		1,179
Accounts receivable, net		2,823		2,823		2,894
Unbilled receivables, net		9,868		9,868		8,194
Current portion of customer financing, net		294		294		309
Inventories		61,250		61,250		61,388
Other current assets		2,396		2,396		2,417
Assets, Current		86,401		86,401		85,194
Customer financing, net		2,817		2,817		2,756
Property, plant and equipment, net		12,605		12,605		12,672
Goodwill		5,550		5,550		5,559
Acquired intangible assets, net		2,494		2,494		2,573
Deferred income taxes		325		325		321
Investments		1,203		1,203		1,260
Other assets, net of accumulated amortization		1,800		1,800		2,027
Assets		113,195		113,195		112,362
Liabilities and equity
Accounts payable		12,904		12,904		12,202
Accrued liabilities		12,240		12,240		13,069
Advances and billings in excess of related costs
Advances and progress billings		50,970		50,970		48,042
Short-term debt and current portion of long-term debt		1,611		1,611		1,335
Total current liabilities		77,725		77,725		74,648
Deferred income taxes		1,900		1,900		2,188
Accrued retiree health care		5,444		5,444		5,545
Accrued pension plan liability, net		16,118		16,118		16,471
Other long-term liabilities		2,875		2,875		2,015
Long-term debt		10,507		10,507		9,782
Retained earnings		52,303		52,303		49,618
Accumulated other comprehensive loss	[1]	(16,139)	(13,234)	(16,139)	(13,234)	(16,373)	$ (13,623)	$ (16,162)	$ (13,415)
Total shareholders’ equity		(1,441)		(1,441)		1,656
Total equity		(1,374)	(822)	(1,374)	(822)	1,713	1,917
Total liabilities and equity		113,195		113,195		112,362
Cash flows - operation activities:
Net earnings		2,196	1,749	4,673	3,328
Non-cash items -
Share-based plans expense				98	98
Depreciation and amortization				1,008	956
Asset Impairment Charges				44	46
Customer financing valuation (benefit)/expense				(2)	5
Gain/(loss) on dispositions, net		3	(2)	7
Other charges and credits, net				112	135
Changes in assets and liabilities -
Accounts receivable				62	(163)
Unbilled receivables				(1,675)	(950)
Advances and progress billings				2,931	3,916
Inventories				408	(1,036)
Other current assets				2	(148)
Accounts payable				682	419
Accrued liabilities				(922)	(570)
Advances and billings in excess of related costs
Income taxes receivable, payable and deferred				269	774
Other long-term liabilities				(65)	(18)
Pension and other postretirement plans				(57)	13
Customer financing, net				(97)	342
Other				352	(100)
Net Cash Provided by (Used in) Operating Activities				7,816	7,047
Cash flows - investing activities:
Payments to Acquire Property, Plant, and Equipment				770	905
Property, plant and equipment reductions				41	25
Contributions to investments				1,537	1,820
Proceeds from investments				1,028	1,441
Purchase of distribution rights				(56)	(131)
Other				(1)	7
Net Cash Provided by (Used in) Investing Activities				(1,295)	(1,383)
Cash flows - financing activities:
New borrowings				3,648	874
Debt repayments				(2,708)	(56)
Stock options exercised				61	240
Employee taxes on certain share-based payment arrangements				(236)	(112)
Common shares repurchased				(5,965)	(5,000)
Dividends paid				(1,997)	(1,720)
Net cash used by financing activities				(7,177)	(5,774)
Effect of exchange rate changes on cash and cash equivalents, including restricted				(36)	52
Net increase/(decrease) in cash & cash equivalents, including restricted				(692)	(58)
Cash & cash equivalents, including restricted, at beginning of year				8,887	8,869	8,869
Cash & cash equivalents, including restricted, at end of period		8,195	8,811	8,195	8,811	8,887	8,869
Restricted Cash and Cash Equivalents	[2]	(74)	(74)	(74)	(74)	(74)
Cash and cash equivalents at end of period		8,121	8,737	8,121	8,737	8,813
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total equity		(1,374)	(822)	(1,374)	(822)	1,713	1,917
Common Stock [Member]
Liabilities and equity
Total equity		5,061	5,061	5,061	5,061	5,061	5,061
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total equity		5,061	5,061	5,061	5,061	5,061	5,061
Additional Paid-In Capital [Member]
Liabilities and equity
Total equity		6,676	4,644	6,676	4,644	6,804	4,762
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total equity		6,676	4,644	6,676	4,644	6,804	4,762
Treasury Stock [Member]
Liabilities and equity
Total equity		(49,342)	(40,730)	(49,342)	(40,730)	(43,454)	(36,097)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total equity		(49,342)	(40,730)	(49,342)	(40,730)	(43,454)	(36,097)
Retained Earnings [Member]
Income Statement [Abstract]
Net earnings				4,673	3,328
Liabilities and equity
Total equity		52,303	43,378	52,303	43,378	49,618	41,754
Cash flows - operation activities:
Net earnings				4,673	3,328
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total equity		52,303	43,378	52,303	43,378	49,618	41,754
Accumulated Other Comprehensive Loss [Member]
Liabilities and equity
Total equity		(16,139)	(13,234)	(16,139)	(13,234)	(16,373)	(13,623)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total equity		(16,139)	(13,234)	(16,139)	(13,234)	(16,373)	(13,623)
Non-Controlling Interest [Member]
Liabilities and equity
Total equity		67	59	67	59	57	60
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total equity		$ 67	59	$ 67	59	57	60
Scenario, Previously Reported [Member]
Income Statement [Abstract]
Sales of products			20,147		38,659
Sales of services			2,592		5,056
Revenues			22,739		43,715
Cost of Goods Sold			(16,443)		(31,806)
Cost of Services			(1,932)		(3,820)
Cost of Revenue			(18,388)		(35,652)
Gross Profit			4,351		8,063
General and Administrative Expense			(1,040)		(1,973)
Research and Development Expense			(813)		(1,651)
Earnings from operations			2,535		4,559
Other income, net			27		49
Earnings before income taxes			2,469		4,428
Income tax expense			(708)		(1,216)
Net earnings			$ 1,761		$ 3,212
Earnings Per Share, Basic			$ 2.93		$ 5.28
Earnings Per Share, Diluted			$ 2.89		$ 5.22
Assets [Abstract]
Accounts receivable, net						10,516
Unbilled receivables, net
Inventories						44,344
Other current assets
Assets, Current						65,161
Customer financing, net						2,740
Deferred income taxes						341
Assets						92,333
Liabilities and equity
Accrued liabilities						15,292
Advances and billings in excess of related costs						27,440
Advances and progress billings
Total current liabilities						56,269
Deferred income taxes						1,839
Total shareholders’ equity						355
Total equity						412	877
Total liabilities and equity						92,333
Cash flows - operation activities:
Net earnings			$ 1,761		$ 3,212
Non-cash items -
Depreciation and amortization					965
Other charges and credits, net					(129)
Changes in assets and liabilities -
Accounts receivable					912
Unbilled receivables
Advances and progress billings
Inventories					(877)
Other current assets
Accrued liabilities					(680)
Advances and billings in excess of related costs					1,934
Income taxes receivable, payable and deferred					712
Customer financing, net					(343)
Other					(99)
Net Cash Provided by (Used in) Operating Activities					7,044
Cash flows - investing activities:
Other					(4)
Net Cash Provided by (Used in) Investing Activities					(1,386)
Cash flows - financing activities:
Net increase/(decrease) in cash & cash equivalents, including restricted					(64)
Cash & cash equivalents, including restricted, at beginning of year					8,801	8,801
Cash & cash equivalents, including restricted, at end of period							8,801
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total equity						412	877
Scenario, Previously Reported [Member] | Retained Earnings [Member]
Liabilities and equity
Total equity						45,320	40,714
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total equity						45,320	40,714
Scenario, Previously Reported [Member] | Accumulated Other Comprehensive Loss [Member]
Liabilities and equity
Total equity						(13,376)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total equity						(13,376)
Scenario, Restated [Member]
Liabilities and equity
Total equity						1,713	1,917
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total equity						1,713	1,917
Scenario, Restated [Member] | Retained Earnings [Member]
Liabilities and equity
Total equity						49,618	41,754
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total equity						49,618	41,754
Scenario, Restated [Member] | Accumulated Other Comprehensive Loss [Member]
Liabilities and equity
Total equity						(16,373)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total equity						(16,373)
Adjustments for New Accounting Pronouncement [Member]
Income Statement [Abstract]
Sales of products			371		1,226
Sales of services			(59)		71
Revenues			312		1,297
Cost of Goods Sold			(381)		(1,080)
Cost of Services			67		(43)
Cost of Revenue			(314)		(1,123)
Gross Profit			(2)		174
General and Administrative Expense			(3)		1
Research and Development Expense					2
Earnings from operations			(5)		177
Other income, net			(2)		2
Earnings before income taxes			(7)		179
Income tax expense			(5)		(63)
Net earnings			$ (12)		$ 116
Earnings Per Share, Basic			$ (0.02)		$ 0.19
Earnings Per Share, Diluted			$ (0.02)		$ 0.19
Assets [Abstract]
Accounts receivable, net						(7,622)
Unbilled receivables, net						8,194
Inventories						17,044
Other current assets						2,417
Assets, Current						20,033
Customer financing, net						16
Deferred income taxes						(20)
Assets						20,029
Liabilities and equity
Accrued liabilities						(2,223)
Advances and billings in excess of related costs						(27,440)
Advances and progress billings						48,042
Total current liabilities						18,379
Deferred income taxes						349
Retained earnings						4,298
Accumulated other comprehensive loss						(2,997)
Total shareholders’ equity						1,301
Total equity						1,301
Total liabilities and equity						20,029
Cash flows - operation activities:
Net earnings			$ (12)		$ 116
Non-cash items -
Depreciation and amortization					(9)
Other charges and credits, net					6
Changes in assets and liabilities -
Accounts receivable					749
Unbilled receivables					(950)
Advances and progress billings					3,916
Inventories					(1,913)
Other current assets					(148)
Accrued liabilities					110
Advances and billings in excess of related costs					(1,934)
Income taxes receivable, payable and deferred					62
Customer financing, net					(1)
Other					1
Net Cash Provided by (Used in) Operating Activities					3
Cash flows - investing activities:
Other					3
Net Cash Provided by (Used in) Investing Activities					3
Cash flows - financing activities:
Net increase/(decrease) in cash & cash equivalents, including restricted					6
Cash & cash equivalents, including restricted, at beginning of year					68	68
Cash & cash equivalents, including restricted, at end of period			$ 74		$ 74		68
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total equity						1,301
Accounting Standards Update 2014-09 [Member]
Income Statement [Abstract]
Net earnings						261	139
Cash flows - operation activities:
Net earnings						261	139
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative Effect of New Accounting Principle in Period of Adoption						1,301	139			$ 901
Accounting Standards Update 2014-09 [Member] | Retained Earnings [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative Effect of New Accounting Principle in Period of Adoption						1,301				$ 901
Accounting Standards Update 2018-02 [Member]
Liabilities and equity
Retained earnings						2,997
Accumulated other comprehensive loss						(2,997)
Fiscal Year 2016 [Member] | Accounting Standards Update 2014-09 [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative Effect of New Accounting Principle in Period of Adoption							$ 139
Fiscal Year 2017 [Member] | Accounting Standards Update 2014-09 [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative Effect of New Accounting Principle in Period of Adoption						$ 261

[1] Net of tax.

[2] Reflects amounts restricted in support of our workers’ compensation programs, employee benefit programs, and insurance premiums.