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Shareholders' Equity (Tables)
 9 Months Ended
Sep. 30, 2016
Shareholders' Equity  
Changes in accumulated other comprehensive loss

The changes in accumulated other comprehensive loss, presented net of tax, which resulted from components of net periodic benefit costs for our defined benefit plans, were as follows (in millions):

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Three months ended 

 

Nine months ended

 

 

 

September 30, 

 

September 30, 

 

 

    

2016

    

2015

 

2016

 

2015

 

Balance, beginning of period

 

$
(343)

 

$
(410)

 

$
(334)

 

$
(404)

 

Other comprehensive income (loss) before reclassifications

 

 
8

 

 
33

 

 
(2)

 

 
22

 

Reclassifications to net income

 

 
8

 

 
9

 

 
9

 

 
14

 

Other comprehensive income, net

 

 
16

 

 
42

 

 
7

 

 
36

 

Balance, end of period

 

$
(327)

 

$
(368)

 

$
(327)

 

$
(368)