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Pensions, Other Post-employment Benefits and Employee Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2017
Retirement Benefits [Abstract]  
Net periodic benefit costs
 
Pension Benefits
 
Other Post-Retirement Benefits
 
Three Months Ended
June 30,
 
Three Months Ended
June 30,
 
2017
 
2016
 
2017
 
2016
 
(in millions)
Service cost
$
5

 
$
4

 
$
—

 
$
—

Interest cost
15

 
17

 
2

 
3

Expected return on plan assets
(14
)
 
(15
)
 
—

 
—

Amortization of actuarial losses
5

 
6

 
—

 
—

Amortization of prior service credit
—

 
—

 
—

 
(1
)
 
$
11

 
$
12

 
$
2

 
$
2

 
Pension Benefits
 
Other Post-Retirement Benefits
 
Six Months Ended
June 30,
 
Six Months Ended
June 30,
 
2017
 
2016
 
2017
 
2016
 
(in millions)
Service cost
$
9

 
$
8

 
$
—

 
$
—

Interest cost
31

 
34

 
5

 
6

Expected return on plan assets
(28
)
 
(29
)
 
—

 
—

Amortization of actuarial losses
11

 
11

 
—

 
1

Amortization of prior service credit
—

 
—

 
(1
)
 
(2
)
 
$
23

 
$
24

 
$
4

 
$
5