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Net Income Per Common Unit (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Basic Net Income per Common Unit |  |
Net income | $ 288 | $ 444
Distributions to participating securities | (1) | (1)
Other | (1) | (3)
Net income allocated to common unitholders | 237 | 406
Diluted Net Income per Common Unit |  |
Net income | 288 | 444
Distributions to participating securities | (1) | (1)
Other | (1) |
Net income allocated to common unitholders | $ 237 | $ 443
Effect of dilutive securities: |  |
Series A preferred units (units) |  | 65
Equity-indexed compensation plan awards (units) | 2 | 2
Series A Preferred Units |  |
Basic Net Income per Common Unit |  |
Distributions to preferred unitholders | $ (37) | $ (34)
Diluted Net Income per Common Unit |  |
Distributions to preferred unitholders | (37) |
Series B Preferred Units |  |
Basic Net Income per Common Unit |  |
Distributions to preferred unitholders | (12) |
Diluted Net Income per Common Unit |  |
Distributions to preferred unitholders | $ (12) |
Common Units |  |
Basic Net Income per Common Unit |  |
Basic weighted average common units outstanding (units) | 725 | 691
Basic net income per common unit (usd per unit) | $ 0.33 | $ 0.59
Diluted Net Income per Common Unit |  |
Basic weighted average common units outstanding (units) | 725 | 691
Effect of dilutive securities: |  |
Diluted weighted average common units outstanding (units) | 727 | 758
Diluted net income per common unit (usd per unit) | $ 0.33 | $ 0.58

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- Definition This element represents the net income (loss) allocated to common unitholders in the calculation of basic net income per common unit after deducting amounts allocated to preferred unitholders, participating securities and the 2% general partner's interest, as applicable, under the two class method. + References No definition available. + Details
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- Definition This element represents the net income (loss) allocated to common unitholders in the calculation of diluted net income per common unit after deducting amounts allocated to preferred unitholders, participating securities and the 2% general partner's interest, as applicable, under the two class method. + References No definition available. + Details
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