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Equity-Indexed Compensation Plans - Compensation Expense (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Other Consolidated Equity-Indexed Compensation Plan Information      
Equity-indexed compensation expense $ 27 $ 98 $ 116
LTIP unit-settled vestings 37 53 48
LTIP cash-settled vestings 66 53 61
DER cash payments 8 $ 8 $ 8
Equity-Indexed Compensation Plan Fair Value Amortization      
2016 37    
2017 21    
2018 11    
2019 3    
2020 1    
Total $ 73