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Pensions, Other Post-retirement Benefits and Employee Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2018
Retirement Benefits [Abstract]  
Net periodic benefit costs
 
Pension Benefits
 
Other Post-Retirement Benefits
 
Three Months Ended March 31,
 
Three Months Ended March 31,
 
2018
 
2017
 
2018
 
2017
 
(in millions)
Service cost
$
6

 
$
4

 
$
—

 
$
—

Interest cost
15

 
16

 
2

 
3

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

 
—

Amortization of actuarial losses
4

 
6

 
—

 
—

Amortization of prior service credit
—

 
—

 
(1
)
 
(1
)
Settlement gain
8

 
—

 
—

 
—

 
$
18

 
$
12

 
$
1

 
$
2