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Equity-Indexed Compensation Plans (Details 3) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Other Consolidated Equity-Indexed Compensation Information        
Equity-indexed compensation expense $ 22 $ 17 $ 90 $ 96
LTIP unit-settled vestings 1 1 52 47
LTIP cash-settled vestings     52 61
DER cash payments $ 2 $ 2 $ 6 $ 5