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Related Party Transactions
 12 Months Ended
Dec. 31, 2016
Related Party Transactions [Abstract]  
Related Party Transactions Related Party TransactionsSales to and purchases from unconsolidated joint ventures for 2016, 2015 and 2014 are as follows:
(in millions)
 
2016
 
2015
 
2014
Sales to unconsolidated affiliates
 
$
11

 
$
11

 
$
16

Purchases from unconsolidated affiliates
 
22

 
19

 
18