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Equity-Indexed Compensation Plans (Details 3) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Other Consolidated Equity-Indexed Compensation Information    
Equity-indexed compensation expense $ 34 $ 51
LTIP unit-settled vestings 5  
LTIP cash-settled vestings 1  
DER cash payments $ 2 $ 2