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Financial and Other Derivative Instruments (Details Textuals) - USD ($)
Mar. 31, 2018
Dec. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
Letters of credit that could be used to offset net derivative liabilities $ 1,000,000 $ 4,000,000
Letters of credit received that could be used to offset net derivative assets 5,000,000 4,000,000
Cash collateral posted, net of cash collateral received 18,000,000 28,000,000
Collateral adjustment on derivative assets 7,000,000 9,000,000
Collateral adjustment on derivative liabilities 22,000,000 22,000,000
Cash collateral paid 15,000,000 18,000,000
Cash collateral received 12,000,000 $ 3,000,000
Additional collateral, aggregate fair value 513,000,000  
Derivative net liability position aggregate fair value 290,000,000  
Collateral already posted fair value 0  
Derivative net asset position, fair value 230,000,000  
Remaining amount of offsets to derivative net liability positions for hard and soft trigger provisions $ 60,000,000