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Leases-Lessee (Details 7) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Future minimum annual rentals under noncancelable operating leases      
2014 $ 53    
2015 47    
2016 43    
2017 36    
2018 30    
Therafter 123    
Total 332    
Operating Leased Assets [Line Items]      
Total rent expense 58 56 49
Jicarilla Apache Nation [Member]
     
Operating Leased Assets [Line Items]      
Future minimum annual rental payment of a certain significant lease $ 8