Derivative Financial Instruments and Risk Management (Details 5) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Offsetting Assets and Liabilities [Abstract]
Gross Amount of Recognized Assets	$ 106	$ 112
Gross Amounts Offset	0	0
Net Amount of Assets	106	112
Gross Amounts Not Offset	(22)	(34)
Net Amount	84	78
Gross Amount of Recognized Liabilities	(76)	(63)
Gross Amounts Offset	0	0
Net Amount of Liabilities	(76)	(63)
Gross Amounts Not Offset	22	34
Net Amount	$ (54)	$ (29)