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Employee Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2015
Defined Pension, Defined Contribution and Other Postretirement Benefit Plans [Abstract]  
Schedule of Defined Benefit Plans Disclosures [Table Text Block]
 
Pension Benefits
Six Months Ended June 30,
 
Other Postretirement Benefits
Six Months Ended June 30,
(Dollars in millions)
2015
 
2014
 
2015
 
2014
Service cost
$
249

 
$
244

 
$
2

 
$
2

Interest cost
701

 
760

 
16

 
20

Expected return on plan assets
(1,134
)
 
(1,108
)
 
—

 
—

Amortization
(5
)
 
(4
)
 
—

 
—

Recognized actuarial net loss (gain)
442

 
214

 
(2
)
 
(2
)
Net settlement and curtailment loss
9

 
6

 
—

 
—

Total net periodic benefit cost
$
262

 
$
112

 
$
16

 
$
20

 
Quarter Ended June 30,
 
Six Months Ended June 30,
(Dollars in millions)
2015
 
2014
 
2015
 
2014
Defined benefit plans
$
25

 
$
60

 
$
70

 
$
144

Defined contribution plans
$
86

 
$
80

 
$
182

 
$
170

 
Pension Benefits
Quarter Ended June 30,
 
Other Postretirement Benefits
Quarter Ended June 30,
(Dollars in millions)
2015
 
2014
 
2015
 
2014
Service cost
$
124

 
$
122

 
$
1

 
$
1

Interest cost
350

 
380

 
8

 
10

Expected return on plan assets
(565
)
 
(554
)
 
—

 
—

Amortization
(2
)
 
(2
)
 
—

 
—

Recognized actuarial net loss (gain)
221

 
107

 
(1
)
 
(1
)
Net settlement and curtailment loss
3

 
6

 
—

 
—

Total net periodic benefit cost
$
131

 
$
59

 
$
8

 
$
10