Future cash outflow to pay for purchases of fixed assets that have occurred.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Organization and Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Millions			3 Months Ended	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Mar. 31, 2015	Jun. 30, 2014
Purchases of property, plant and equipment included in accounts payable	$ 46	$ 13
Noncontrolling Interest [Member]
Quantifying Misstatement in Current Year Financial Statements, Amount			$ 9
Productive Asset Purchase [Member]
Quantifying Misstatement in Current Year Financial Statements, Amount				$ (30)