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Commitments and Contingencies (Future Minimum Capital Lease Payments) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Debt Instrument [Line Items]  
2014 $ 43
2015 36
2016 24
2017 13
2018 7
Thereafter 10
Total 133
Less amount representing interest (1) (13) [1]
Capital lease obligations $ 120
Capital leases [Member]
 
Debt Instrument [Line Items]  
Weighted average interest rate 5.30%
[1] The weighted average interest rate on our capital lease obligations as of December 31, 2013 was approximately 5.3 percent.