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Accumulated Other Comprehensive Loss (Tables)
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]    
Summary of the entity's accumulated other comprehensive income (loss) by component
The tables below summarize changes in accumulated other comprehensive loss recorded on our consolidated balance sheets by component for the three and six months ended June 30, 2017:
 
Pension Plans
 
Post-Retirement
Benefit Plans
 
Foreign Currency
Translation
Adjustment
and Other
 
Total
 
(Dollars in millions)
Balance at March 31, 2017
$
(1,865
)
 
(159
)
 
(62
)
 
(2,086
)
Other comprehensive income (loss) before reclassifications
—

 
—

 
4

 
4

Amounts reclassified from accumulated other comprehensive income
29

 
3

 
—

 
32

Net current-period other comprehensive income
29

 
3

 
4

 
36

Balance at June 30, 2017
$
(1,836
)
 
(156
)
 
(58
)
 
(2,050
)

 
Pension Plans
 
Post-Retirement
Benefit Plans
 
Foreign Currency
Translation
Adjustment
and Other
 
Total
 
(Dollars in millions)
Balance at December 31, 2016
$
(1,895
)
 
(162
)
 
(60
)
 
(2,117
)
Other comprehensive income (loss) before reclassifications
—

 
—

 
2

 
2

Amounts reclassified from accumulated other comprehensive income
59

 
6

 
—

 
65

Net current-period other comprehensive income
59

 
6

 
2

 
67

Balance at June 30, 2017
$
(1,836
)
 
(156
)
 
(58
)
 
(2,050
)
The tables below summarize changes in accumulated other comprehensive loss recorded on our consolidated balance sheets by component for the three and six months ended June 30, 2016:
 
Pension Plans
 
Post-Retirement
Benefit Plans
 
Foreign Currency
Translation
Adjustment
and Other
 
Total
 
(Dollars in millions)
Balance at March 31, 2016
$
(1,690
)
 
(177
)
 
(40
)
 
(1,907
)
Other comprehensive income (loss) before reclassifications
—

 
—

 
(4
)
 
(4
)
Amounts reclassified from accumulated other comprehensive income
27

 
3

 
—

 
30

Net current-period other comprehensive income
27

 
3

 
(4
)
 
26

Balance at June 30, 2016
$
(1,663
)
 
(174
)
 
(44
)
 
(1,881
)
 
Pension Plans
 
Post-Retirement
Benefit Plans
 
Foreign Currency
Translation
Adjustment
and Other
 
Total
 
(Dollars in millions)
Balance at December 31, 2015
$
(1,715
)
 
(180
)
 
(39
)
 
(1,934
)
Other comprehensive income (loss) before reclassifications
—

 
—

 
(5
)
 
(5
)
Amounts reclassified from accumulated other comprehensive income
52

 
6

 
—

 
58

Net current-period other comprehensive income
52

 
6

 
(5
)
 
53

Balance at June 30, 2016
$
(1,663
)
 
(174
)
 
(44
)
 
(1,881
)
Schedule of reclassifications out of accumulated other comprehensive income (loss) by component
The tables below present further information about our reclassifications out of accumulated other comprehensive loss by component for the three and six months ended June 30, 2017:
Three Months Ended June 30, 2017
 
Decrease (Increase)
in Net Income
 
Affected Line Item in Consolidated Statement of
Operations
 
 
(Dollars in millions)
 
 
Amortization of pension & post-retirement plans(1)
 
 
 
 
Net actuarial loss
 
$
52

 
Other (expense) income, net
Prior service cost
 
3

 
Other (expense) income, net
Total before tax
 
55

 
 
Income tax benefit
 
(23
)
 
Income tax expense
Net of tax
 
$
32

 
 
Six Months Ended June 30, 2017
 
Decrease (Increase)
in Net Income
 
Affected Line Item in Consolidated Statement of
Operations
 
 
(Dollars in millions)
 
 
Amortization of pension & post-retirement plans(1)
 
 
 
 
Net actuarial loss
 
$
103

 
Other (expense) income, net
Prior service cost
 
6

 
Other (expense) income, net
Total before tax
 
109

 
 
Income tax benefit
 
(44
)
 
Income tax expense
Net of tax
 
$
65

 
 
________________________________________________________________________
(1) 
See Note 6—Employee Benefits for additional information on our net periodic benefit (expense) income related to our pension and post-retirement plans.
The tables below present further information about our reclassifications out of accumulated other comprehensive loss by component for the three and six months ended June 30, 2016:
Three Months Ended June 30, 2016
 
Decrease (Increase)
in Net Income
 
Affected Line Item in Consolidated Statement of
Operations
 
 
(Dollars in millions)
 
 
Amortization of pension & post-retirement plans(1)
 
 
 
 
Net actuarial loss
 
$
45

 
Other (expense) income, net
Prior service cost
 
3

 
Other (expense) income, net
Total before tax
 
48

 
 
Income tax benefit
 
(18
)
 
Income tax expense
Net of tax
 
$
30

 
 
Six Months Ended June 30, 2016
 
Decrease (Increase)
in Net Income
 
Affected Line Item in Consolidated Statement of
Operations
 
 
(Dollars in millions)
 
 
Amortization of pension & post-retirement plans(1)
 
 
 
 
Net actuarial loss
 
$
87

 
Other (expense) income, net
Prior service cost
 
6

 
Other (expense) income, net
Total before tax
 
93

 
 
Income tax benefit
 
(35
)
 
Income tax expense
Net of tax
 
$
58

 
 
________________________________________________________________________
(1) 
See Note 6—Employee Benefits for additional information on our net periodic benefit (expense) income related to our pension and post-retirement plans.