Derivative Financial Instruments and Risk Management (Details 5) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Offsetting Assets and Liabilities [Abstract]
Gross Amount of Recognized Assets	$ 84	$ 112
Gross Amounts Offset	0	0
Net Amount of Assets	84	112
Gross Amounts Not Offset	(19)	(34)
Net Amount	65	78
Gross Amount of Recognized Liabilities	(108)	(63)
Gross Amounts Offset	0	0
Net Amount of Liabilities	(108)	(63)
Gross Amounts Not Offset	19	34
Net Amount	$ (89)	$ (29)