Derivative Financial Instruments and Risk Management (Details 5) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Offsetting Assets and Liabilities [Abstract]
Gross Amount of Recognized Assets	$ 55	$ 72
Gross Amounts Offset	0	0
Net Amount of Assets	55	72
Gross Amounts Not Offset	(14)	(7)
Net Amount	41	65
Gross Amount of Recognized Liabilities	(39)	(8)
Gross Amounts Offset	0	0
Net Amount of Liabilities	(39)	(8)
Gross Amounts Not Offset	14	7
Net Amount	$ (25)	$ (1)