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Equity Indexed Compensation Plans (Details 3) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Other Consolidated Equity-Indexed Compensation Information        
Equity-indexed compensation expense $ 27 $ 20 $ 78 $ 60
LTIP unit-settled vestings 46 33 46 58
LTIP cash-settled vestings 60 29 60 65
DER cash payments 2 2 4 4
PNG
       
Other Consolidated Equity-Indexed Compensation Information        
LTIP unit-settled vestings   $ 1   $ 1