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Variable Interest Entity (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013	Dec. 31, 2012
Variable Interest Entity [Line Items]
Cash and cash equivalents	$ 2,391	$ 3,393	$ 3,069	$ 1,592
PP&E	57,134	55,821
Non-controlling amounts	523	246
BridgeTex
Variable Interest Entity [Line Items]
Minority ownership interest (as a percent)	50.00%
Cash and cash equivalents	63	82
PP&E	922	420
Non-controlling amounts	$ 523	$ 246

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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