Derivative Financial Instruments and Risk Management (Details 3) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Derivative
Balance at beginning of year, net of tax	$ (8)	$ (6)	$ (14)
Gains (losses) deferred during the year, net of tax	(1)	1	(1)
(Gains) losses reclassified to earnings, net of tax	4	(3)	9
Balance at end of year, net of tax	(5)	(8)	(6)
Beginning balance, tax	4	3	6
Gains (losses) deferred, tax	1	0	0
(Gains) losses reclassified to earnings, tax	2	(1)	3
Ending balance, tax	$ 3	$ 4	$ 3