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Pension and Other Post Employment Benefits (Tables)
 12 Months Ended
Dec. 31, 2017
Retirement Benefits [Abstract]  
Schedule of changes in the benefit obligations, plan assets and funded status of the plans
The following table shows the change in the benefit obligation, plan assets and funded status for the defined benefit pension plans:
 
Pension Benefits
 
Other Post-Employment
Benefits
 
2017
 
2016
 
2017
 
2016
 
(In millions)
Benefit obligation
$
50

 
$
48

 
$
1

 
$
1

Fair value of plan assets
40

 
38

 
—

 
—

Unfunded status recognized in Other liabilities
$
(10
)
 
$
(10
)
 
$
(1
)
 
$
(1
)
 
 
 
 
 
 
 
 
Amounts recognized in Accumulated other comprehensive income
$
15

 
$
16

 
$
—

 
$
—