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Other Assets, Net (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Other Assets, Net      
Debt issue costs $ 70 $ 69  
Fair value of derivative instruments 30 10  
Intangible assets 674 642  
Other 37 54  
Other assets, gross 811 775  
Accumulated amortization (271) (189)  
Other assets, net 540 586  
Debt issuance costs capitalized during the period 9 20  
Write off of debt issuance cost 8 5  
Amortization expense related to other assets (including finite-lived intangible assets) 96 99 44
Amortization expense for finite-lived intangible assets $ 85 $ 90 $ 36