XML 24 R31.htm IDEA: XBRL DOCUMENT v2.4.0.8
Fair Value Measurements - Debt (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, carrying value $ 7,242 $ 6,828
Level 2 [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Long-term debt, fair value $ 8,453 $ 7,626