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Basis of Presentation (Unaudited) (Tables)
 9 Months Ended
Sep. 30, 2017
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
2017
 
2016
 
2017
 
2016
Operating Income
$
102

 
$
121

 
$
315

 
$
387

Net Earnings(1)
66

 
79

 
205

 
252

Diluted earnings per share(1)
0.38

 
0.44

 
1.17

 
1.39

(1) 
Based on statutory tax rates
Accumulated Other Comprehensive Loss
The components of accumulated other comprehensive loss are as follows:
$ in millions
September 30,
2017
 
December 31,
2016
Unamortized benefit plan costs, net of tax benefit of $3,257 in 2017 and $3,439 in 2016
$
(5,116
)
 
$
(5,416
)
Cumulative translation adjustment
(132
)
 
(132
)
Net unrealized gain on marketable securities and cash flow hedges, net of tax
5

 
2

Total accumulated other comprehensive loss
$
(5,243
)
 
$
(5,546
)