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Quarterly Financial Data (Unaudited) (Schedule of Quarterly Financial Information) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
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Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 8,899 | $ 7,705 | $ 7,415 | $ 6,083 | $ 7,744 | $ 8,473 | $ 9,423 | $ 8,564 | $ 30,102 | $ 34,204 | $ 52,639
Operating income (loss) | (236) | 646 | 805 | 695 | 210 | 573 | 878 | 589 | 1,910 | 2,250 | 2,372
Net income (loss) | (760) | 41 | 424 | 336 | (138) | 238 | 772 | 221 | 41 | 1,093 | 1,124
Limited Partners’ interest in net income | $ 226 | $ 207 | $ 239 | $ 311 | $ 312 | $ 291 | $ 298 | $ 282 | $ 983 | $ 1,183 | $ 629
Basic net income per limited partner unit | $ 0.22 | $ 0.20 | $ 0.23 | $ 0.30 | $ 0.30 | $ 0.28 | $ 0.28 | $ 0.26 | $ 0.94 | $ 1.11 | $ 0.58
Diluted net income per limited partner unit | $ 0.21 | $ 0.19 | $ 0.23 | $ 0.30 | $ 0.30 | $ 0.28 | $ 0.28 | $ 0.26 | $ 0.92 | $ 1.11 | $ 0.58

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- Definition Aggregate amount of net income allocated to limited partners. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187171-122770 + Details
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