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Business Combinations Business Combinations (Narrative) (Details) (USD $)
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9 Months Ended | 1 Months Ended | ||||||
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Sep. 30, 2014
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Sep. 30, 2013
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Dec. 31, 2013
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Sep. 30, 2014
Senior Notes [Member]
5.15% Notes Due 2043 [Member]
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Dec. 31, 2013
Senior Notes [Member]
5.15% Notes Due 2043 [Member]
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Nov. 30, 2013
Senior Notes [Member]
5.15% Notes Due 2043 [Member]
Debt Offering Part One [Member]
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Jul. 31, 2013
Plains Pipeline Acquisition [Member]
New Mexico System [Member]
mi
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Nov. 30, 2013
Plains Pipeline Acquisition [Member]
Rocky Mountains [Member]
Terminal
mi
bbl
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| Business Acquisition [Line Items] | ||||||||
| Pipeline Length | 250 | 550 | ||||||
| Payments to Acquire Businesses, Net of Cash Acquired | $ 0 | $ 57,000,000 | $ 57,000,000 | $ 135,000,000 | ||||
| Number of Pipeline Terminals | 4 | |||||||
| Storage Capacity | 1,700,000 | |||||||
| Debt Instrument, Face Amount | $ 3,000,000,000.0 | $ 2,700,000,000.0 | $ 550,000,000.0 | $ 300,000,000.0 | $ 300,000,000.0 | |||