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Employee Benefit Plans
 6 Months Ended
Jun. 30, 2017
Retirement Benefits [Abstract]  
Pension and Other Postretirement Benefits Disclosure [Text Block]
Employee Benefit Plans
Pension and Postretirement Plans. We sponsor both funded and unfunded domestic and foreign defined pension and other postretirement benefit plans, and defined contribution plans. 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


Effective January 1, 2017, a voluntary lump-sum option is available for the frozen final average earnings benefits of certain U.S. salaried employees upon termination of employment after 2016. This option provides participants with the choice of electing to receive a lump-sum payment in lieu of receiving a future monthly pension benefit. This plan change reduced the projected benefit obligation by $170 million.