Fair Value Measurements and Disclosures (Details 3) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014		Dec. 31, 2013
Fair Value Disclosures [Abstract]
Long Term Debt Net of Unamortized Discount, Carrying Amount	$ 4,866	[1]	$ 4,465	[1]
Long Term Debt Net Of Unamortized Discount, Fair Value	$ 5,617	[1]	$ 4,959	[1]

[1] Excludes capital lease and other obligations.