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Partners' Capital (Allocations of Net Income) (Details) - USD ($) $ / shares in Units, $ in Millions |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 Months Ended
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Feb. 14, 2018 | Nov. 14, 2017 | Aug. 15, 2017 | May 16, 2017 | Feb. 16, 2017 | Nov. 15, 2016 | Aug. 15, 2016 | May 16, 2016 | Feb. 16, 2016 | Nov. 27, 2015 | Aug. 28, 2015 | May 29, 2015 | Feb. 27, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Schedule of Partners' Capital [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution Made to Limited Partner, Cash Distributions Paid |  | $ 82 | $ 82 | $ 82 | $ 81 | $ 79 | $ 79 | $ 78 | $ 70 | $ 47 | $ 29 | $ 23 | $ 21 | $ 431 | $ 386 | $ 120
Cash distribution per unit (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3.3020 | $ 3.2938 | $ 2.8851
General Partner [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Partners' Capital [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution Made to Limited Partner, Cash Distributions Paid |  | $ 22 | $ 21 | $ 21 | $ 21 | $ 20 | $ 20 | $ 20 | $ 17 | $ 8 | $ 3 | $ 1 | $ 1 |  |  |
Common Units [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Partners' Capital [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 328 | $ 317 | $ 156
Distributions in excess of net income |  |  |  |  |  |  |  |  |  |  |  |  |  | (293) | (809) | (112)
Limited partners' interest in net income |  |  |  |  |  |  |  |  |  |  |  |  |  | 35 | (492) | 44
Subordinated Units [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Partners' Capital [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 23
Distributions in excess of net income |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | (12)
Limited partners' interest in net income |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ 11
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Partners' Capital [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution Made to Limited Partner, Cash Distributions Paid | $ 82 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Member] | General Partner [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Partners' Capital [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribution Made to Limited Partner, Cash Distributions Paid | $ 21 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition The total amount of dividends declared in the period for each class of stock and the contractual amount of dividends (or interest on participating income bonds) that must be paid for the period (for example, unpaid cumulative dividends). Dividends declared in the current period do not include dividends declared in respect of prior-period unpaid cumulative dividends. Preferred dividends that are cumulative only if earned are deducted only to the extent that they are earned. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 60B -URI http://asc.fasb.org/extlink&oid=96947427&loc=SL5780133-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 60A -URI http://asc.fasb.org/extlink&oid=96947427&loc=SL5780132-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 60 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e2740-109256 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 66 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e2814-109256 + Details
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