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Derivative and Other Financial Instruments (Schedule of Offsetting Derivative Assets and Liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Derivative assets    
Gross amounts recognized in the Balance Sheet $ 47 $ 63
Gross amounts not offset in the Balance Sheet 19 17
Net amount 28 46
Derivative liabilities    
Gross amounts recognized in the Balance Sheet 59 23
Gross amounts not offset in the Balance Sheet 19 17
Net amount $ 40 $ 6