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Derivatives And Hedging Activities Derivatives Not Designated as Hedges (Details)
$ in Millions, ₩ in Billions
9 Months Ended
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Mar. 01, 2018
USD ($)
Mar. 01, 2018
KRW (₩)
Derivative [Line Items]        
Derivative, Cash Received on Hedge $ (6) $ (12)    
Not Designated as Hedging Instrument        
Derivative [Line Items]        
Derivative, Loss on Derivative   $ 5    
KUM | Not Designated as Hedging Instrument | Foreign exchange forward | Korea (South), Won        
Derivative [Line Items]        
Notional amount of derivative     $ 520 ₩ 559
Derivative, Cash Received on Hedge 4      
Derivative, Gain (Loss) on Derivative, Net $ 4