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Pensions, Other Post-retirement Benefits and Employee Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2017
Retirement Benefits [Abstract]  
Net periodic benefit costs
 
Pension Benefits
 
Other Post-Retirement Benefits
 
Three Months Ended
September 30,
 
Three Months Ended
September 30,
 
2017
 
2016
 
2017
 
2016
 
(in millions)
Service cost
$
4

 
$
5

 
$
—

 
$
—

Interest cost
16

 
17

 
4

 
3

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

 
—

Amortization of actuarial losses
9

 
6

 
—

 
1

Amortization of prior service credit
—

 
—

 
(2
)
 
(1
)
 
$
14

 
$
14

 
$
2

 
$
3

 
Pension Benefits
 
Other Post-Retirement Benefits
 
Nine Months Ended
September 30,
 
Nine Months Ended
September 30,
 
2017
 
2016
 
2017
 
2016
 
(in millions)
Service cost
$
13

 
$
13

 
$
—

 
$
—

Interest cost
47

 
51

 
9

 
9

Expected return on plan assets
(43
)
 
(43
)
 
—

 
—

Amortization of actuarial losses
20

 
17

 
—

 
2

Amortization of prior service credit
—

 
—

 
(3
)
 
(3
)
 
$
37

 
$
38

 
$
6

 
$
8