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Shareholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2017
Equity [Abstract]  
Changes in Issued and Treasury shares

Changes in our ordinary shares issued during the years ended December 31, 2017, 2016 and 2015, were as follows:
(Shares in millions)
Issued
Balance at December 31, 2014
774

Equity Awards Granted, Vested and Exercised
5

Balance at December 31, 2015
779

Share Issuance
200

Equity Awards Granted, Vested and Exercised
4

Balance at December 31, 2016
983

Equity Awards Granted, Vested and Exercised
10

Balance at December 31, 2017
993
Schedule of Accumulated Other Comprehensive Income (Loss)
The following table presents the changes in our accumulated other comprehensive loss by component for the year ended December 31, 2017 and 2016:
(Dollars in millions)
Currency Translation Adjustment
 
Defined Benefit Pension
 
Deferred Loss on Derivatives
 
Total
Balance at December 31, 2015
$
(1,602
)
 
$
(29
)
 
$
(10
)
 
$
(1,641
)
Other Comprehensive (Loss) Income before Reclassifications
(12
)
 
41

 
—

 
29

Reclassifications
—

 
1

 
1

 
2

Net Activity
(12
)
 
42

 
1

 
31

Balance at December 31, 2016
(1,614
)
 
13

 
(9
)
 
(1,610
)
Other Comprehensive Income before Reclassifications
130

 
1

 
—

 
131

Reclassifications
—

 
(40
)
 
—

 
(40
)
Net Activity
130

 
(39
)
 
—

 
91

Balance at December 31, 2017
$
(1,484
)
 
$
(26
)
 
$
(9
)
 
$
(1,519
)