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Equity-Indexed Compensation Plans (Details 4) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Other Consolidated Equity-Indexed Compensation Information      
Equity-indexed compensation expense $ 116 $ 101 $ 110
LTIP unit-settled vestings 48 62 24
LTIP cash-settled vestings 61 66 19
DER cash payments 8 7 4
Equity-Indexed Compensation Plan Fair Value Amortization      
2014 80    
2015 55    
2016 36    
2017 16    
2018 5    
Thereafter 1    
Total 193    
PNG
     
Other Consolidated Equity-Indexed Compensation Information      
LTIP unit-settled vestings   1 2
PNG | Maximum
     
Other Consolidated Equity-Indexed Compensation Information      
LTIP unit-settled vestings $ 1