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Financial Instruments (Interest Rate Exposure) (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Derivative [Line Items]      
One month LIBOR rate In effect 0.77%    
Fair value changes reclassified from other comprehensive earnings $ 9,000,000 $ 4,000,000 $ 6,000,000
Interest Rate Swap Ending in January 2018 [Member]      
Derivative [Line Items]      
Notional amount $ 500,000,000    
Derivative, fixed interest rate 0.92%    
Interest Rate Swap [Member]      
Derivative [Line Items]      
Notional amount of derivatives terminated $ 1,250,000,000    
Fair value changes reclassified from other comprehensive earnings $ 2,000,000