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Accumulated Other Comprehensive Loss (Tables)
 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
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 nine months ended September 30, 2016:
 
Pension Plans
 
Post-Retirement
Benefit Plans
 
Foreign Currency
Translation
Adjustment
and Other
 
Total
 
(Dollars in millions)
Balance at June 30, 2016
$
(1,663
)
 
(174
)
 
(44
)
 
(1,881
)
Other comprehensive income (loss) before reclassifications
—

 
—

 
(4
)
 
(4
)
Amounts reclassified from accumulated other comprehensive income
26

 
4

 
—

 
30

Net current-period other comprehensive income
26

 
4

 
(4
)
 
26

Balance at September 30, 2016
$
(1,637
)
 
(170
)
 
(48
)
 
(1,855
)
 
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
—

 
—

 
(9
)
 
(9
)
Amounts reclassified from accumulated other comprehensive income
78

 
10

 
—

 
88

Net current-period other comprehensive income
78

 
10

 
(9
)
 
79

Balance at September 30, 2016
$
(1,637
)
 
(170
)
 
(48
)
 
(1,855
)
The tables below summarize changes in accumulated other comprehensive loss recorded on our consolidated balance sheets by component for the three and nine months ended months ended September 30, 2015:
 
Pension Plans
 
Post-Retirement
Benefit Plans
 
Foreign Currency
Translation
Adjustment
and Other
 
Total
 
(Dollars in millions)
Balance at June 30, 2015
$
(1,668
)
 
(266
)
 
(25
)
 
(1,959
)
Other comprehensive income (loss) before reclassifications
—

 
—

 
(10
)
 
(10
)
Amounts reclassified from accumulated other comprehensive income
24

 
4

 
—

 
28

Net current-period other comprehensive income
24

 
4

 
(10
)
 
18

Balance at September 30, 2015
$
(1,644
)
 
(262
)
 
(35
)
 
(1,941
)
 
Pension Plans
 
Post-Retirement
Benefit Plans
 
Foreign Currency
Translation
Adjustment
and Other
 
Total
 
(Dollars in millions)
Balance at December 31, 2014
$
(1,720
)
 
(272
)
 
(25
)
 
(2,017
)
Other comprehensive income (loss) before reclassifications
—

 
—

 
(10
)
 
(10
)
Amounts reclassified from accumulated other comprehensive income
76

 
10

 
—

 
86

Net current-period other comprehensive income
76

 
10

 
(10
)
 
76

Balance at September 30, 2015
$
(1,644
)
 
(262
)
 
(35
)
 
(1,941
)
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 nine months ended September 30, 2016:
Three Months Ended September 30, 2016
 
(Decrease) Increase
in Net Income
 
Affected Line Item in Consolidated Statement of
Operations or Footnote Where Additional
Information is Presented If The Amount is not
Recognized in Net Income in Total
 
 
(Dollars in millions)
 
 
Amortization of pension & post-retirement plans
 
 
 
 
Net actuarial loss
 
$
(44
)
 
See Note 4-Employee Benefits
Prior service cost
 
(3
)
 
See Note 4-Employee Benefits
Total before tax
 
(47
)
 
 
Income tax benefit
 
17

 
Income tax expense
Net of tax
 
$
(30
)
 
 
Nine Months Ended September 30, 2016
 
(Decrease) Increase
in Net Income
 
Affected Line Item in Consolidated Statement of
Operations or Footnote Where Additional
Information is Presented If The Amount is not
Recognized in Net Income in Total
 
 
(Dollars in millions)
 
 
Amortization of pension & post-retirement plans
 
 
 
 
Net actuarial loss
 
$
(131
)
 
See Note 4-Employee Benefits
Prior service cost
 
(9
)
 
See Note 4-Employee Benefits
Total before tax
 
(140
)
 
 
Income tax benefit
 
52

 
Income tax expense
Net of tax
 
$
(88
)
 
 
The tables below present further information about our reclassifications out of accumulated other comprehensive loss by component for the three and nine months ended months ended September 30, 2015:
Three Months Ended September 30, 2015
 
(Decrease) Increase
in Net Income
 
Affected Line Item in Consolidated Statement of
Operations or Footnote Where Additional
Information is Presented If The Amount is not
Recognized in Net Income in Total
 
 
(Dollars in millions)
 
 
Amortization of pension & post-retirement plans
 
 
 
 
Net actuarial loss
 
$
(40
)
 
See Note 4-Employee Benefits
Prior service cost
 
(7
)
 
See Note 4-Employee Benefits
Total before tax
 
(47
)
 
 
Income tax benefit
 
19

 
Income tax expense
Net of tax
 
$
(28
)
 
 


Nine Months Ended September 30, 2015
 
(Decrease) Increase
in Net Income
 
Affected Line Item in Consolidated Statement of
Operations or Footnote Where Additional
Information is Presented If The Amount is not
Recognized in Net Income in Total
 
 
(Dollars in millions)
 
 
Amortization of pension & post-retirement plans
 
 
 
 
Net actuarial loss
 
$
(120
)
 
See Note 4-Employee Benefits
Prior service cost
 
(20
)
 
See Note 4-Employee Benefits
Total before tax
 
(140
)
 
 
Income tax benefit
 
54

 
Income tax expense
Net of tax
 
$
(86
)