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Equity (Relinquishments of Incentive Distribution Rights) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Subsequent Event [Member] | Currently Effective IDRs [Member]        
Relinquishment of Incentive Distributions $ 33 $ 128 $ 138 $ 626