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New Accounting Pronouncements (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Jan. 01, 2017
Dec. 31, 2016
Jun. 30, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Accumulated other comprehensive loss $ (317)   $ (618) $ 23
Accounting Standards Update 2016-01 [Member] | Adjustments for New Accounting Principle, Early Adoption [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Accumulated other comprehensive loss   $ 174