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Equity Compensation Plans (Details 2) (USD $)
In Millions
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Other Consolidated Equity Compensation Information        
Equity compensation expense $ 27 $ 14 $ 46 $ 33
LTIP unit vestings 23 25 23 25
LTIP cash settled vestings 18 10 18 10
DER cash payments 1 1 2 2
PNG LTIP Awards Including Transaction Grants
       
Other Consolidated Equity Compensation Information        
LTIP unit vestings $ 1   $ 1