Derivative Financial Instruments and Risk Management (Details 4) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Derivative
Balance at beginning of year, net of tax	$ (5)	$ (5)	$ (8)
Gains (losses) deferred during the year, net of tax	2	(4)	(1)
(Gains) losses reclassified to earnings, net of tax	3	4	4
Balance at end of year, net of tax	0	(5)	(5)
Beginning balance, tax	3	3	4
Gains (losses) deferred, tax	(1)	2	1
(Gains) losses reclassified to earnings, tax	(2)	(2)	(2)
Ending balance, tax	$ 0	$ 3	$ 3