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Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2017
Accounting Policies [Abstract]  
Reconciliation of Cash, Cash Equivalents and Restricted Cash
The following table provides a reconciliation of Cash, Cash Equivalents and Restricted Cash as reported within the Consolidated Statements of Cash Flows:
 
 
(In millions)
December 31,
 
2017
 
2016
 
2015
Cash and Cash Equivalents
$
1,043

 
$
1,132

 
$
1,476

Restricted Cash
67

 
57

 
26

Total Cash, Cash Equivalents and Restricted Cash
$
1,110

 
$
1,189

 
$
1,502