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Employee Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2017
Retirement Benefits [Abstract]  
Schedule of Defined Benefit Plans Disclosures [Table Text Block]
Contributions to our plans were as follows:
 
Quarter Ended June 30,
 
Six Months Ended June 30,
(Dollars in millions)
2017
 
2016
 
2017
 
2016
Defined benefit plans
$
33

 
$
32

 
$
79

 
$
107

Defined contribution plans
86

 
78

 
176

 
156


There were no contributions to our domestic defined benefit pension plans in the quarters and six months ended June 30, 2017 and 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 June 30,
 
Other Postretirement Benefits
Quarter Ended June 30,
(Dollars in millions)
2017
 
2016
 
2017
 
2016
Service cost
$
93

 
$
97

 
$
1

 
$
1

Interest cost
279

 
304

 
6

 
8

Expected return on plan assets
(541
)
 
(559
)
 
—

 
—

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

 
—

Recognized actuarial net loss (gain)
143

 
136

 
(2
)
 
(1
)
Net settlement and curtailment (gain) loss
(2
)
 
3

 
—

 
—

Total net periodic benefit (income) cost
$
(37
)
 
$
(26
)
 
$
5

 
$
8


 
Pension Benefits
Six Months Ended June 30,
 
Other Postretirement Benefits
Six Months Ended June 30,
(Dollars in millions)
2017
 
2016
 
2017
 
2016
Service cost
$
186

 
$
191

 
$
2

 
$
2

Interest cost
557

 
606

 
13

 
16

Expected return on plan assets
(1,081
)
 
(1,115
)
 
—

 
—

Amortization of prior service credit
(18
)
 
(15
)
 
—

 
—

Recognized actuarial net loss (gain)
286

 
271

 
(5
)
 
(2
)
Net settlement and curtailment (gain) loss
(1
)
 
15

 
—

 
—

Total net periodic benefit (income) cost
$
(71
)
 
$
(47
)
 
$
10

 
$
16