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Financial Instruments (Cash Flows Hedge) (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Derivative      
Fair value changes reclassified from other comprehensive earnings $ 0 $ 0 $ 9,000,000
Cash Flow Hedge | Interest rate swap      
Derivative      
Notional amount of derivatives terminated   500,000,000 1,250,000,000
Fair value changes reclassified from other comprehensive earnings   1,000,000 2,000,000
Gain (loss) on interest rate derivative 0 0 (7,000,000)
Gain (loss) reclassified from accumulated other comprehensive earnings into income $ (1,000,000) $ (1,000,000) $ (9,000,000)