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Debt - Maturities (Details) (USD $)
9 Months Ended
Sep. 30, 2013
Debt Disclosure [Abstract]  
Period over which cash generated from operations, together with amounts available under various liquidity facilities will be adequate to permit entity to meet debt maturities (in months) 12 months
2014 $ 6,559,000,000
2015 2,298,400,000
2016 1,206,200,000
2017 278,700,000
2018 3,004,300,000
After 2018 $ 3,698,000,000