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Commitments and Contingencies Future Minimum Payments (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Commitments and Contingencies Disclosure [Abstract]      
2014 $ 110    
2015 101    
2016 76    
2017 59    
2018 40    
Thereafter 53    
Total minimum lease payments 439    
Rent expense $ 152 $ 152 $ 131