Long-Term Debt (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Debt Disclosure [Abstract]
Total debt at par value	$ 10,083	$ 11,228
Unamortized discount, net	(227)	(383)
Net carrying amount	9,856	10,845
Fair Value	$ 10,500	$ 11,600