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Series A Preferred Units (Rollforward of Redeemable Preferred Units) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
[1]
Redeemable Noncontrolling Interest [Line Items]    
Balance at December 31, 2019 $ 968  
Distributions to unitholders and general partner (717) $ (515)
Balance at March 31, 2020 968  
Series A Convertible Preferred Units    
Redeemable Noncontrolling Interest [Line Items]    
Balance at December 31, 2019 968  
Net income allocated 20  
Distributions to unitholders and general partner (20)  
Balance at March 31, 2020 $ 968  
[1]
Financial information for the first quarter of 2019 has been retrospectively adjusted for the acquisition of ANDX. See Notes 1 and 3.