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Equity-Indexed Compensation Plans (Details 3) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Other Consolidated Equity-Indexed Compensation Information        
Equity-indexed compensation expense $ 34 $ 27 $ 68 $ 78
LTIP unit-settled vestings 44 46 51 46
LTIP cash-settled vestings 51 60 52 60
DER cash payments $ 2 $ 2 $ 4 $ 4