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Derivatives - Fair Value on Consolidated Balance Sheets (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
1.125% Call Option | Current assets    
Derivative [Line Items]    
Derivative asset $ 267 $ 374
1.125% Conversion Option | Current liabilities    
Derivative [Line Items]    
Derivative liability $ 267 $ 374