Quarterly report pursuant to Section 13 or 15(d)

Ownership Structure (Details)

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Ownership Structure (Details) (USD $)
In Millions, except Share data, unless otherwise specified
9 Months Ended 12 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Ownership Structure    
Units authorized and issued (in shares) 167,015,394 167,015,394
Number of classes of outstanding units not entitled to current cash distributions or are convertible into indebtedness 3  
Class I units
   
Ownership Structure    
Units authorized and issued (in shares) 107,281,058 107,281,058
Special allocation (as a percent) 8.00% 8.00%
Aggregate liquidation priority, including the special allocation $ 2,325 $ 2,191
Class A and B units
   
Ownership Structure    
Units authorized and issued (in shares) 40,007,463 40,007,463
Class A and B profit units
   
Ownership Structure    
Units authorized and issued (in shares) 19,726,873 19,726,873