Recast 2017 Financial Information (Details 1) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Product	$ 4,289	$ 3,997
Service	2,446	2,413
Total sales	6,735	6,410
Product	3,265	2,983
Service	1,905	1,867
General and administrative expenses	711	698
Operating income	854	862
Interest and Debt Expense	(143)	(75)
Net FAS (non-service) Pension Benefit (Expense)	120	(18)
Other, net	40	19
Earnings before income taxes	871	788
Federal and foreign income tax expense	132	138
Net earnings	$ 739	$ 650
Earnings Per Share, Basic	$ 4.24	$ 3.72
Weighted Average Number of Shares Outstanding, Basic	174.3	174.8
Earnings Per Share, Diluted	$ 4.21	$ 3.69
Weighted Average Number of Shares Outstanding, Diluted	175.4	176.1
Change in unamortized benefit plan costs, net of tax	$ 86	$ 99
Change in cumulative translation adjustment	(2)	4
Other, net	(1)	2
Other comprehensive income, net of tax	83	105
Comprehensive income	$ 822	755
Previously Reported [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Product		3,834
Service		2,433
Total sales		6,267
Product		2,871
Service		1,887
General and administrative expenses		677
Operating income		832
Interest and Debt Expense		(75)
Net FAS (non-service) Pension Benefit (Expense)		0
Other, net		16
Earnings before income taxes		773
Federal and foreign income tax expense		133
Net earnings		$ 640
Earnings Per Share, Basic		$ 3.66
Weighted Average Number of Shares Outstanding, Basic		174.8
Earnings Per Share, Diluted		$ 3.63
Weighted Average Number of Shares Outstanding, Diluted		176.1
Change in unamortized benefit plan costs, net of tax		$ 99
Change in cumulative translation adjustment		4
Other, net		2
Other comprehensive income, net of tax		105
Comprehensive income		745
Accounting Standards Update 2014-09 [Member] | Restatement Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Product		163
Service		(20)
Total sales		143
Product		121
Service		(14)
General and administrative expenses		21
Operating income		15
Interest and Debt Expense		0
Net FAS (non-service) Pension Benefit (Expense)		0
Other, net		0
Earnings before income taxes		15
Federal and foreign income tax expense		5
Net earnings		$ 10
Earnings Per Share, Basic		$ 0.06
Weighted Average Number of Shares Outstanding, Basic		0.0
Earnings Per Share, Diluted		$ 0.06
Weighted Average Number of Shares Outstanding, Diluted		0.0
Change in unamortized benefit plan costs, net of tax		$ 0
Change in cumulative translation adjustment		0
Other, net		0
Other comprehensive income, net of tax		0
Comprehensive income		10
Accounting Standards Update 2017-07 [Domain] | Restatement Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Product		0
Service		0
Total sales		0
Product		(9)
Service		(6)
General and administrative expenses		0
Operating income		15
Interest and Debt Expense		0
Net FAS (non-service) Pension Benefit (Expense)		(18)
Other, net		3
Earnings before income taxes		0
Federal and foreign income tax expense		0
Net earnings		$ 0
Earnings Per Share, Basic		$ 0.00
Weighted Average Number of Shares Outstanding, Basic		0.0
Earnings Per Share, Diluted		$ 0.00
Weighted Average Number of Shares Outstanding, Diluted		0.0
Change in unamortized benefit plan costs, net of tax		$ 0
Change in cumulative translation adjustment		0
Other, net		0
Other comprehensive income, net of tax		0
Comprehensive income		$ 0