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Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2015
Compensation and Retirement Disclosure [Abstract]  
Schedule of Changes in Benefit Obligation and Plan Assets
The following table sets forth, on an aggregated basis, changes in the benefit obligation and plan assets, the funded status and how the funded status is recognized on our consolidated balance sheets.
Table 17.1: Changes in Benefit Obligation and Plan Assets
 
 
Defined Pension 
Benefits
 
Other Postretirement
Benefits
(Dollars in millions)
 
2015
 
2014
 
2015
 
2014
Change in benefit obligation:
 
 
 
 
 
 
 
 
Benefit obligation as of January 1,
 
$
204

 
$
185

 
$
55

 
$
53

Service cost
 
1

 
1

 
0

 
0

Interest cost
 
8

 
8

 
2

 
2

Benefits paid
 
(15
)
 
(17
)
 
(3
)
 
(3
)
Net actuarial (gain) loss
 
(13
)
 
27

 
(9
)
 
3

Benefit obligation as of December 31,
 
$
185

 
$
204

 
$
45

 
$
55

Change in plan assets:
 
 
 
 
 
 
 
 
Fair value of plan assets as of January 1,
 
$
239

 
$
230

 
$
7

 
$
7

Actual return on plan assets
 
(3
)
 
25

 
(1
)
 
0

Employer contributions
 
1

 
1

 
2

 
3

Benefits paid
 
(15
)
 
(17
)
 
(3
)
 
(3
)
Fair value of plan assets as of December 31,
 
$
222

 
$
239

 
$
5

 
$
7

Over (under) funded status as of December 31,
 
$
37

 
$
35

 
$
(40
)
 
$
(48
)
Schedule of Amounts Recognized in Balance Sheet
 
 
Defined Pension 
Benefits
 
Other Postretirement
Benefits
(Dollars in millions)
 
2015
 
2014
 
2015
 
2014
Balance sheet presentation as of December 31,
 
 
 
 
 
 
 
 
Other assets
 
$
48

 
$
48

 
$
0

 
$
0

Other liabilities
 
(11
)
 
(13
)
 
(40
)
 
(48
)
Net amount recognized as of December 31,
 
$
37

 
$
35

 
$
(40
)
 
$
(48
)
Accumulated benefit obligation as of December 31,
 
$
185

 
$
204

 
 
 
Schedule of Net Periodic Benefit Cost
The following table presents the components of net periodic benefit costs and other amounts recognized in other comprehensive income.
Table 17.2: Components of Net Periodic Benefit Cost
 
 
Year Ended December 31,
 
 
2015
 
2014
 
2015
 
2014
(Dollars in millions)
 
Defined Pension 
Benefits
 
Other Postretirement
Benefits
Components of net periodic benefit cost:
 
 
 
 
 
 
 
 
Service cost
 
$
1

 
$
1

 
$
0

 
$
0

Interest cost
 
8

 
8

 
2

 
2

Expected return on plan assets
 
(15
)
 
(14
)
 
0

 
0

Amortization of transition obligation, prior service credit and net actuarial loss (gain)
 
1

 
1

 
(4
)
 
(3
)
Net periodic benefit gain
 
$
(5
)
 
$
(4
)
 
$
(2
)
 
$
(1
)
Schedule of Changes Recognized in Accumulated Other Comprehensive Income
Changes recognized in other comprehensive income, pretax:
 
 
 
 
 
 
 
 
Net actuarial (loss) gain
 
$
(5
)
 
$
(16
)
 
$
7

 
$
(3
)
Reclassification adjustments for amounts recognized in net periodic benefit cost
 
1

 
1

 
(4
)
 
(3
)
Total (loss) gain recognized in other comprehensive income
 
$
(4
)
 
$
(15
)
 
$
3

 
$
(6
)
Schedule of Pre-Tax Amounts in Accumulated Other Comprehensive Income
Pre-tax amounts recognized in AOCI that have not yet been recognized as a component of net periodic benefit cost consist of the following:
Table 17.3: Amounts Recognized in AOCI
 
 
December 31,
  
 
2015
 
2014
 
2015
 
2014
(Dollars in millions)
 
Defined Pension
Benefits
 
Other Postretirement
Benefits
Prior service cost
 
$
0

 
$
0

 
$
(2
)
 
$
(1
)
Net actuarial (loss) gain
 
(71
)
 
(67
)
 
12

 
8

Accumulated other comprehensive (loss) income
 
$
(71
)
 
$
(67
)
 
$
10

 
$
7
Schedule of Pre-Tax Amount In Accumulated Other Comprehensive Income That Are Expected To Be Recognized Of Net Periodic Benefit Cost
Table 17.4: Estimated Amortization of Unamortized Actuarial Gains and Losses - 2016
 
 
2016 Estimate
(Dollars in millions)
 
Defined
Pension
Benefits
 
Other
Postretirement
Benefits
Prior service cost
 
$
0

 
$
1

Net actuarial (loss) gain
 
(1
)
 
3

Net (loss) gain
 
$
(1
)
 
$
4
Schedule Of Weighted Average Assumptions Used in Accounting for Plans
The following table presents weighted-average assumptions used in the accounting for the plans:
Table 17.5: Assumptions Used in the Accounting for the Plans
 
 
December 31,
 
 
2015
 
2014
 
2015
 
2014
 
 
Defined Pension 
Benefits
 
Other Postretirement 
Benefits
Assumptions for benefit obligations at measurement date:
 
 
 
 
 
 
 
 
Discount rate
 
4.2%
 
3.9%
 
4.2%
 
3.9%
Assumptions for periodic benefit cost for the year ended:
 
 
 
 
 
 
 
 
Discount rate
 
3.9
 
4.6
 
3.9
 
4.6
Expected long-term rate of return on plan assets
 
6.5
 
6.5
 
6.5
 
6.5
Assumptions for year-end valuations:
 
 
 
 
 
 
 
 
Health care cost trend rate assumed for next year:
 
 
 
 
 
 
 
 
Pre-age 65
 
N/A
 
N/A
 
7.0
 
7.3
Post-age 65
 
N/A
 
N/A
 
7.1
 
7.4
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate)
 
N/A
 
N/A
 
4.5
 
4.5
Year the rate reaches the ultimate trend rate
 
N/A
 
N/A
 
2037
 
2028
Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates
Table 17.6: Sensitivity Analysis
 
 
Year Ended December 31,
(Dollars in millions)
 
2015
 
2014
  
 
1% Increase
 
1% Decrease
 
1% Increase
 
1% Decrease
Effect on year-end postretirement benefit obligation
 
$
5

 
$
(4
)
 
$
7

 
$
(6
)
Effect on total service and interest cost components
 
0

 
0

 
0

 
0
Schedule of Allocation of Plan Assets
Table 17.8: Plan Assets Measured at Fair Value on a Recurring Basis
 
 
December 31, 2015
 
 
Fair Value Measurements Using
 
Assets
at Fair
   Value  
(Dollars in millions)
 
Level 1  
 
Level 2
 
Level 3  
 
Common collective trusts
 
$
0

 
$
129

 
$
0

 
$
129

Corporate bonds (S&P rating of A or higher)
 
0

 
15

 
0

 
15

Corporate bonds (S&P rating of lower than A)
 
0

 
30

 
0

 
30

Government securities
 
0

 
40

 
0

 
40

Mortgage-backed securities
 
0

 
12

 
0

 
12

Municipal bonds
 
0

 
1

 
0

 
1

Total planned assets
 
$
0

 
$
227

 
$
0

 
$
227

 
 
December 31, 2014
 
 
Fair Value Measurements Using
 
Assets
at Fair
  Value  
(Dollars in millions)
 
Level 1  
 
Level 2  
 
Level 3  
 
Common collective trusts
 
$
0

 
$
146

 
$
0

 
$
146

Corporate bonds (S&P rating of A or higher)
 
0

 
16

 
0

 
16

Corporate bonds (S&P rating of lower than A)
 
0

 
30

 
0

 
30

Government securities
 
0

 
38

 
0

 
38

Mortgage-backed securities
 
0

 
15

 
0

 
15

Municipal bonds
 
0

 
1

 
0

 
1

Total planned assets
 
$
0

 
$
246

 
$
0

 
$
246

The qualified defined benefit pension plan asset allocations as of the annual measurement dates are as follows:
Table 17.7: Plan Assets
 
 
December 31,
 
 
2015
 
2014
Common collective trusts(1)
 
57%
 
59%
Corporate bonds (Standard & Poor’s [“S&P”] rating of A or higher)
 
6
 
6
Corporate bonds (S&P rating of lower than A)
 
13
 
12
Government securities
 
18
 
16
Mortgage-backed securities
 
5
 
6
Municipal bonds
 
1
 
1
Total
 
100%
 
100%
__________
(1) 
Common collective trusts include domestic and international equity securities.
Schedule of Expected Future Benefit Payments
Table 17.9: Expected Future Benefits Payments
(Dollars in millions)
 
Pension
Benefits
 
Postretirement
Benefits
2016
 
$
13

 
$
3

2017
 
12

 
3

2018
 
12

 
3

2019
 
12

 
3

2020
 
12

 
3

2021-2025
 
54

 
13