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Employee Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2017
Retirement Benefits [Abstract]  
Schedule of Defined Benefit Plans Disclosures [Table Text Block]
Contributions to our plans were as follows:
 
Quarter Ended September 30,
 
Nine Months Ended September 30,
(Dollars in millions)
2017
 
2016
 
2017
 
2016
Defined benefit plans
$
1,929

 
$
18

 
$
2,008

 
$
125

Defined contribution plans
86

 
79

 
262

 
235


There was a $1.9 billion contribution to our domestic defined benefit pension plans in the quarter and nine months ended September 30, 2017. There were no contributions to our domestic defined benefit pension plans in the quarter and nine months ended September 30, 2016. The following table illustrates the components of net periodic benefit cost for our defined pension and other postretirement benefit plans:
 
Pension Benefits
Quarter Ended September 30,
 
Other Postretirement Benefits
Quarter Ended September 30,
(Dollars in millions)
2017
 
2016
 
2017
 
2016
Service cost
$
94

 
$
96

 
$
—

 
$
1

Interest cost
281

 
302

 
9

 
9

Expected return on plan assets
(555
)
 
(554
)
 
—

 
—

Amortization of prior service credit
(9
)
 
(7
)
 
(1
)
 
—

Recognized actuarial net loss (gain)
144

 
135

 
(2
)
 
(1
)
Net settlement and curtailment loss
2

 
3

 
—

 
—

Total net periodic benefit (income) cost
$
(43
)
 
$
(25
)
 
$
6

 
$
9


 
Pension Benefits
Nine Months Ended September 30,
 
Other Postretirement Benefits
Nine Months Ended September 30,
(Dollars in millions)
2017
 
2016
 
2017
 
2016
Service cost
$
280

 
$
287

 
$
2

 
$
3

Interest cost
838

 
908

 
22

 
25

Expected return on plan assets
(1,636
)
 
(1,669
)
 
—

 
—

Amortization of prior service credit
(27
)
 
(22
)
 
(1
)
 
—

Recognized actuarial net loss (gain)
430

 
406

 
(7
)
 
(3
)
Net settlement and curtailment loss
1

 
18

 
—

 
—

Total net periodic benefit (income) cost
$
(114
)
 
$
(72
)
 
$
16

 
$
25