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Employee Benefit Plans
 6 Months Ended
Jun. 30, 2017
Compensation and Retirement Disclosure [Abstract]  
Employee Benefit Plans
Note 8 – Employee Benefit Plans
Net periodic benefit cost (credit) is as follows:

Pension Benefits

Three Months Ended 
 June 30,

Six Months Ended 
 June 30,

2017

2016

2017

2016

(Millions)
Components of net periodic benefit cost (credit):







Service cost
$
12


$
13


$
25


$
27

Interest cost
14


16


29


31

Expected return on plan assets
(21
)

(21
)

(41
)

(42
)
Amortization of net actuarial loss
7


7


14


15

Net actuarial loss from settlements
—


1


—


1

Net periodic benefit cost (credit)
$
12


$
16


$
27


$
32


 
Other Postretirement Benefits
 
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
 
2017
 
2016
 
2017
 
2016
 
(Millions)
Components of net periodic benefit cost (credit):
 
 
 
 
 
 
 
Service cost
$
1

 
$
1

 
$
1

 
$
1

Interest cost
2

 
2

 
4

 
4

Expected return on plan assets
(3
)
 
(3
)
 
(6
)
 
(6
)
Amortization of prior service credit
(4
)
 
(5
)
 
(7
)
 
(8
)
Reclassification to regulatory liability
1

 
1

 
2

 
2

Net periodic benefit cost (credit)
$
(3
)
 
$
(4
)
 
$
(6
)
 
$
(7
)

Amortization of prior service credit and net actuarial loss included in net periodic benefit cost (credit) for our other postretirement benefit plans associated with Transco and Northwest Pipeline are recorded to regulatory assets/liabilities instead of other comprehensive income (loss). The amounts of amortization of prior service credit recognized in regulatory liabilities were $2 million and $3 million for the three months ended June 30, 2017 and 2016, respectively, and $4 million and $5 million for the six months ended June 30, 2017 and 2016, respectively.
During the six months ended June 30, 2017, we contributed $49 million to our pension plans and $3 million to our other postretirement benefit plans. We presently anticipate making additional contributions of approximately $34 million to our pension plans and approximately $4 million to our other postretirement benefit plans in the remainder of 2017.