Recast 2017 Financial Information (Details 1) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Sales	$ 8,085	$ 6,569	$ 21,939	$ 19,452
General and administrative expenses	817	679	2,267	2,063
Operating income	1,178	837	2,855	2,572
Interest and Debt Expense	(133)	(73)	(420)	(224)
Net FAS (non-service) Pension Benefit (Expense)	135	2	380	(33)
Other, net	57	16	142	67
Earnings before income taxes	1,237	782	2,957	2,382
Federal and foreign income tax expense	93	139	385	534
Net earnings	$ 1,144	$ 643	$ 2,572	$ 1,848
Earnings Per Share, Basic	$ 6.57	$ 3.69	$ 14.76	$ 10.59
Weighted Average Number of Shares Outstanding, Basic	174.1	174.2	174.3	174.5
Earnings Per Share, Diluted	$ 6.54	$ 3.67	$ 14.68	$ 10.52
Weighted Average Number of Shares Outstanding, Diluted	174.9	175.3	175.2	175.6
Change in unamortized benefit plan costs, net of tax	$ 84	$ 99	$ 256	$ 300
Change in cumulative translation adjustment	(2)	0	(4)	0
Other, net	1	0	5	(3)
Other comprehensive income, net of tax	81	99	247	303
Comprehensive income	1,225	742	2,819	2,151
Product
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Sales	5,614	4,183	14,693	12,217
Cost of sales	4,229	3,189	11,188	9,209
Service
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Sales	2,471	2,386	7,246	7,235
Cost of sales	$ 1,861	1,864	$ 5,629	5,608
Previously Reported [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Sales		6,527		19,169
General and administrative expenses		666		2,009
Operating income		845		2,532
Interest and Debt Expense		(73)		(224)
Net FAS (non-service) Pension Benefit (Expense)		0		0
Other, net		13		57
Earnings before income taxes		785		2,365
Federal and foreign income tax expense		140		528
Net earnings		$ 645		$ 1,837
Earnings Per Share, Basic		$ 3.70		$ 10.53
Weighted Average Number of Shares Outstanding, Basic		174.2		174.5
Earnings Per Share, Diluted		$ 3.68		$ 10.46
Weighted Average Number of Shares Outstanding, Diluted		175.3		175.6
Change in unamortized benefit plan costs, net of tax		$ 99		$ 300
Change in cumulative translation adjustment		0		0
Other, net		0		(3)
Other comprehensive income, net of tax		99		303
Comprehensive income		744		2,140
Previously Reported [Member] | Product
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Sales		4,135		11,885
Cost of sales		3,153		8,982
Previously Reported [Member] | Service
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Sales		2,392		7,284
Cost of sales		1,863		5,646
Adjustments for New Accounting Pronouncement [Member] | Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Sales		42		283
General and administrative expenses		13		54
Operating income		(3)		17
Interest and Debt Expense		0		0
Net FAS (non-service) Pension Benefit (Expense)		0		0
Other, net		0		0
Earnings before income taxes		(3)		17
Federal and foreign income tax expense		(1)		6
Net earnings		$ (2)		$ 11
Earnings Per Share, Basic		$ (0.01)		$ 0.06
Weighted Average Number of Shares Outstanding, Basic		0.0		0.0
Earnings Per Share, Diluted		$ (0.01)		$ 0.06
Weighted Average Number of Shares Outstanding, Diluted		0.0		0.0
Change in unamortized benefit plan costs, net of tax		$ 0		$ 0
Change in cumulative translation adjustment		0		0
Other, net		0		0
Other comprehensive income, net of tax		0		0
Comprehensive income		(2)		11
Adjustments for New Accounting Pronouncement [Member] | Accounting Standards Update 2017-07 [Domain]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Sales		0		0
General and administrative expenses		0		0
Operating income		(5)		23
Interest and Debt Expense		0		0
Net FAS (non-service) Pension Benefit (Expense)		2		(33)
Other, net		3		10
Earnings before income taxes		0		0
Federal and foreign income tax expense		0		0
Net earnings		$ 0		$ 0
Earnings Per Share, Basic		$ 0.00		$ 0.00
Weighted Average Number of Shares Outstanding, Basic		0.0		0.0
Earnings Per Share, Diluted		$ 0.00		$ 0.00
Weighted Average Number of Shares Outstanding, Diluted		0.0		0.0
Change in unamortized benefit plan costs, net of tax		$ 0		$ 0
Change in cumulative translation adjustment		0		0
Other, net		0		0
Other comprehensive income, net of tax		0		0
Comprehensive income		0		0
Adjustments for New Accounting Pronouncement [Member] | Product | Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Sales		48		332
Cost of sales		33		241
Adjustments for New Accounting Pronouncement [Member] | Product | Accounting Standards Update 2017-07 [Domain]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Sales		0		0
Cost of sales		3		(14)
Adjustments for New Accounting Pronouncement [Member] | Service | Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Sales		(6)		(49)
Cost of sales		(1)		(29)
Adjustments for New Accounting Pronouncement [Member] | Service | Accounting Standards Update 2017-07 [Domain]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Sales		0		0
Cost of sales		$ 2		$ (9)