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Partners' Capital and Distributions - Preferred Unit Issuance (Details) $ / shares in Units, $ in Millions |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Oct. 10, 2017 USD ($) $ / shares shares | Jan. 28, 2016 USD ($) count $ / shares shares | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Nov. 15, 2022 $ / shares
Partners Capital and Distribution [Line Items] |  |  |  |  |
Net proceeds from sale of Series A preferred units | $ |  |  |  | $ 1,542 |
Net proceeds from the sale of Series B preferred units | $ |  |  | $ 788 |  |
Series A Preferred Units |  |  |  |  |
Partners Capital and Distribution [Line Items] |  |  |  |  |
Sale of Series A preferred units (in units) | shares |  | 61,000,000 |  |  |
Sale of units, price per unit (in dollars per unit) |  | $ 26.25 |  |  |
Transaction fee due to purchasers |  | 2.00% |  |  |
Net proceeds from sale of Series A preferred units | $ |  | $ 1,600 |  |  |
Quarterly distributions per unit (in dollars per unit) |  | $ 0.525 |  |  |
Annualized distribution rate (in dollars per unit) |  | $ 2.10 |  |  |
Series A preferred unit conversion ratio |  | 1 |  |  |
Common unit closing price as a percentage of Issue Price, over which the entity has conversion option |  | 150.00% |  |  |
Period for closing price of common units to be above threshold, to trigger conversion option |  | 20 days |  |  |
Period after fifth and subsequent anniversaries of issuance for Distribution Rate Resets |  | 30 days |  |  |
Number of distribution rate reset elections allowed | count |  | 1 |  |  |
Distribution rate reset, basis spread on variable rate |  | 5.85% |  |  |
Period after sixth anniversary of issuance, after which units may be redeemed if distribution rate has been reset |  | 30 days |  |  |
Value of common units if exchanged for redemption of preferred units, as a percentage of average price |  | 95.00% |  |  |
Redemption price as a percentage of Issue Price |  | 110.00% |  |  |
Series B Preferred Units |  |  |  |  |
Partners Capital and Distribution [Line Items] |  |  |  |  |
Sale of units, price per unit (in dollars per unit) | $ 1,000 |  |  |  |
Sale of Series B preferred units (in units) | shares | 800,000 |  |  |  |
Net proceeds from the sale of Series B preferred units | $ | $ 788 |  |  |  |
Liquidation preference (in dollars per unit) | $ 1,000 |  |  |  |
Distribution rate percentage | 6.125% |  |  |  |
Distribution rate per unit | $ 61.25 |  |  |  |
Redemption price (in dollars per unit) | $ 1,020 |  |  |  |
Redemption price percentage | 102.00% |  |  |  |
Series B Preferred Units | Forecast |  |  |  |  |
Partners Capital and Distribution [Line Items] |  |  |  |  |
Percentage spread on top of LIBOR for distribution |  |  |  |  | 4.11%
Redemption price (in dollars per unit) |  |  |  |  | $ 1,000

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- Definition The percentage transaction fee due to purchasers of units of limited partnership interest issued in a private placement. + References No definition available. + Details
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- Definition The percentage of the volume-weighted average price of the partnership's common units for a specified trading period, at which such common units are valued if given in exchange for the redemption of the preferred units. + References No definition available. + Details
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- Definition The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(d)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(d)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21484-112644 + Details
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