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Net Income Per Limited Partner Unit (Schedule of Net Income By Class of Participating Securities) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Limited Partners' Capital Account [Line Items]    
Distributions declared $ 209 $ 184
Distributions less than (more than) net income 17 14
Net income (basic) $ 226 $ 198
Common Units    
Limited Partners' Capital Account [Line Items]    
Weighted-average units outstanding—basic (in shares) 228,312,261 124,257,933
Dilutive effect of preferred units (in shares) 13,819,791 13,819,791
Weighted-average units outstanding—diluted (in shares) 242,132,052 138,077,724
Net income per limited partner unit—basic (in dollars per share) $ 0.95 $ 0.96
Net income per limited partner unit—diluted (in dollars per share) $ 0.93 $ 0.92
Limited Partner | Common Units    
Limited Partners' Capital Account [Line Items]    
Distributions declared $ 199 $ 105
Distributions less than (more than) net income 17 14
Net income (basic) 216 119
Dilutive effect of preferred units 10 8
Net income (diluted) 226 127
Limited Partner | Preferred Units    
Limited Partners' Capital Account [Line Items]    
Distributions declared 10 10
Distributions less than (more than) net income 0 0
Net income (basic) 10 10
General Partner    
Limited Partners' Capital Account [Line Items]    
Distributions declared $ 0 69
Distributions less than (more than) net income   0
Net income (basic)   $ 69