Derivative Financial Instruments and Risk Management (Details 6) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Offsetting Assets and Liabilities
Gross Amount of Recognized Assets	$ 91	$ 101
Gross Amounts Offset	0	0
Net Amount of Assets	91	101
Gross Amounts Not Offset	(5)	(8)
Net Amount	86	93
Gross Amount of Recognized Liabilities	(10)	(23)
Gross Amounts Offset	0	0
Net Amount of Liabilities	(10)	(23)
Gross Amounts Not Offset	5	8
Net Amount	$ (5)	$ (15)