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Fair Value Measurements - Schedule of Fair Value Measured on a Nonrecurring Basis (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Sep. 30, 2014
Fair Value Disclosures [Abstract]        
Property and equipment   $ 24 $ 5 $ 144 [1]
Investments in affiliates, fair value   29 205  
Long-term debt       64 [1]
Impairment losses 0 54 20  
Property and equipment [member]
       
Fair Value Disclosures [Abstract]        
Impairment losses   53 20  
Investments in affiliates [member]
       
Fair Value Disclosures [Abstract]        
Impairment losses   $ 20 $ 141  
[1] Fair value measurements using significant unobservable inputs (Level 3).