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Basis of Presentation (Unaudited) (Tables)
 9 Months Ended
Sep. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of Change in Accounting Estimate [Table Text Block]
The following table presents the effect of aggregate net EAC adjustments:
 
Three Months Ended September 30
 
Nine Months Ended September 30
$ in millions, except per share data
2018
 
2017
 
2018
 
2017
Operating Income
$
149

 
$
114

 
$
408

 
$
357

Net Earnings(1)
117

 
74

 
322

 
232

Diluted earnings per share(1)
0.67

 
0.42

 
1.84

 
1.32

(1) 
Based on statutory tax rates in effect for each period presented.
Contract with Customer, Asset and Liability [Table Text Block]
Net contract assets (liabilities) are as follows:
$ in millions
September 30,
2018
 
December 31,
2017
$ Change
% Change
Unbilled receivables, net
$
5,600

 
$
3,465

$
2,135

62
 %
Advance payments and amounts in excess of costs incurred
(1,686
)
 
(1,761
)
75

(4
)%
Net contract assets (liabilities)
$
3,914

 
$
1,704

$
2,210

130
 %
Accumulated Other Comprehensive Loss
The components of accumulated other comprehensive loss are as follows:
$ in millions
September 30,
2018
 
December 31,
2017
Unamortized benefit plan costs, net of tax benefit of $1,912 for 2018 and $3,056 for 2017
$
(5,390
)
 
$
(4,586
)
Cumulative translation adjustment
(140
)
 
(136
)
Other, net
(5
)
 
4

Total accumulated other comprehensive loss
$
(5,535
)
 
$
(4,718
)