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Accumulated Other Elements of Comprehensive Income (Loss) (Tables)
 12 Months Ended
Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Components of accumulated other elements of comprehensive income (loss)
Accumulated other elements of comprehensive income (loss) comprised the following
(dollars in millions)
Accumulated Foreign Currency Translation
Gain (Loss)
 
Prior Service Credits and Net
Actuarial Losses
 
Accumulated Gain (Loss) on Cash
Flow Hedges
 
Total
 
Other Comprehensive Income (Loss)
 
 
 
 
 
 
 
 
 
 
Balance at December 31, 2012
$
46

 
$
(87
)
 
$
11

 
$
(30
)
 
 
 
 
 
 
 
 
 
 
 
 
Foreign currency translation gain (loss)
(95
)
 
—

 
—

 
(95
)
 
$
(95
)
Actuarial gains (losses) recognized in other comprehensive income, net of tax
—

 
40

 
—

 
40

 
40

Amortization of actuarial (gains) losses, net of tax
—

 
2

 
—

 
2

 
2

Gain (loss) on derivatives recognized in other comprehensive income, net of tax
—

 
—

 
6

 
6

 
6

(Gain) loss on derivatives reclassified from accumulated other comprehensive income, net of tax
 

 
 

 
(3
)
 
(3
)
 
(3
)
Balance at December 31, 2013
(49
)
 
(45
)
 
14

 
(80
)
 
$
(50
)
 
 
 
 
 
 
 
 
 
 
Foreign currency translation gain (loss)
(379
)
 
—

 
—

 
(379
)
 
$
(379
)
Actuarial gains (losses) recognized in other comprehensive income, net of tax
—

 
(31
)
 
—

 
(31
)
 
(31
)
Curtailment and settlement gains (losses)
recognized in other comprehensive income, net of tax
—

 
(3
)
 
—

 
(3
)
 
(3
)
Amortization of actuarial (gains) losses, net of tax
—

 
1

 
—

 
1

 
1

Gain (loss) on derivatives recognized in other comprehensive income, net of tax
—

 
—

 
(52
)
 
(52
)
 
(52
)
(Gain) loss on derivatives reclassified from accumulated other comprehensive income, net of tax
—

 
—

 
4

 
4

 
4

Balance at December 31, 2014
(428
)
 
(78
)
 
(34
)
 
(540
)
 
$
(460
)
 
 
 
 
 
 
 
 
 
 
Foreign currency translation gain (loss)
(358
)
 
—

 
—

 
(358
)
 
$
(358
)
Actuarial gains (losses) recognized in other comprehensive income, net of tax
—

 
12

 
—

 
12

 
12

Curtailment and settlement gains (losses)
recognized in other comprehensive income, net of tax
—

 
1

 
—

 
1

 
1

Amortization of actuarial (gains) losses, net of tax
—

 
3

 
—

 
3

 
3

Gain (loss) on derivatives recognized in other comprehensive income, net of tax
—

 
—

 
(54
)
 
(54
)
 
(54
)
(Gain) loss on derivatives reclassified from accumulated other comprehensive income, net of tax
—

 
—

 
59

 
59

 
59

 
 
 
 
 
 
 
 
 
 
Balance of December 31, 2015
$
(786
)
 
$
(62
)
 
$
(29
)
 
$
(877
)
 
$
(337
)