Derivative Financial Instruments and Risk Management (Details 4) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Derivative
Balance at beginning of period, net of tax	$ 0	$ (5)
Gains (losses) deferred during the period, net of tax	(1)	1
(Gains) losses reclassified to earnings, net of tax	2	1
Balance at end of period, net of tax	1	(3)
Beginning balance, tax	0	3
Gains (losses) deferred during the period, tax	0	(1)
(Gains) losses reclassified to earnings, tax	0	0
Ending balance, tax	$ 0	$ 2