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Redeemable Preferred Units (Rollforward of Redeemable Preferred Units) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Redeemable Noncontrolling Interest [Line Items] |  |
Balance at December 31, 2017 | $ 1,000 |
Distributions to unitholders and general partner | (347) | $ (242)
Balance at March 31, 2018 | 1,000 |
Series A Convertible Preferred Units |  |
Redeemable Noncontrolling Interest [Line Items] |  |
Balance at December 31, 2017 | 1,000 |
Net income | 16 |
Distributions to unitholders and general partner | (16) |
Balance at March 31, 2018 | $ 1,000 |

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- Definition Carrying amount, attributable to parent and noncontrolling interests, of an entity's issued and outstanding stock which is not included within permanent equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. Includes stock with a put option held by an ESOP and stock redeemable by a holder only in the event of a change in control of the issuer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.27(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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