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Equity-Indexed Compensation Plans - Compensation Expense (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Other Consolidated Equity-Indexed Compensation Plan Information      
Equity-indexed compensation expense $ 79 $ 41 $ 60
LTIP unit or share-settled vestings 21 16 24
LTIP cash-settled vestings 22 $ 25 $ 28
Equity-indexed Compensation Plan Fair Value Amortization      
2019 30    
2020 14    
2021 5    
2022 1    
2023 0    
Total 50    
Maximum      
Equity-indexed Compensation Plan Fair Value Amortization      
2023 $ 1