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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2017
Equity [Abstract]  
Changes in Balance of Accumulated Other Comprehensive Loss, Net of Income Taxes
Changes in the balance of AOCL, net of income taxes, consisted of the following (in millions):
 
 
Postretirement  
Benefit Plans (a)  
 
Other, net

 
AOCL

Balance at December 31, 2014
 
$
(11,813
)
 
$
(57
)
 
$
(11,870
)
Other comprehensive loss before reclassifications
 
(351
)
 
(73
)
 
(424
)
Amounts reclassified from AOCL
 
 
 
 
 

Recognition of net actuarial losses
 
1,109

 
—

 
1,109

Amortization of net prior service credits
 
(259
)
 
—

 
(259
)
Total reclassified from AOCL
 
850

 
—

 
850

Total other comprehensive income (loss)
 
499

 
(73
)
 
426

Balance at December 31, 2015
 
(11,314
)
 
(130
)
 
(11,444
)
Other comprehensive loss before reclassifications
 
(1,232
)
 
—

 
(1,232
)
Amounts reclassified from AOCL
 
 
 
 
 

Recognition of net actuarial losses
 
938

 
—

 
938

Amortization of net prior service credits
 
(239
)
 
—

 
(239
)
Recognition of net prior service credits from divestiture of IS&GS segment (b)
 
(134
)
 
—

 
(134
)
Other
 
—

 
9

 
9

Total reclassified from AOCL
 
565

 
9

 
574

Total other comprehensive (loss) income
 
(667
)
 
9

 
(658
)
Balance at December 31, 2016
 
(11,981
)
 
(121
)
 
(12,102
)
Other comprehensive (loss) income before reclassifications
 
(1,380
)
 
120

 
(1,260
)
Amounts reclassified from AOCL
 
 
 
 
 

Recognition of net actuarial losses
 
1,030

 
—

 
1,030

Amortization of net prior service credits
 
(228
)
 
—

 
(228
)
Other
 
—

 
20

 
20

Total reclassified from AOCL
 
802

 
20

 
822

Total other comprehensive (loss) income
 
(578
)
 
140

 
(438
)
Balance at December 31, 2017
 
$
(12,559
)
 
$
19

 
$
(12,540
)
(a) 
AOCL related to postretirement benefit plans is shown net of tax benefits of $6.5 billion at both December 31, 2017 and 2016 and $6.2 billion at December 31, 2015. These tax benefits include amounts recognized on our income tax returns as current deductions and deferred income taxes, which will be recognized on our tax returns in future years. See “Note 9 – Income Taxes” and “Note 11 – Postretirement Benefit Plans” for more information on our income taxes and postretirement benefit plans.
(b) 
Associated with the 2016 divestiture of the IS&GS business and included in net gain on divestiture of discontinued operations.