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Segment and Related Information - Balance Sheet Data (Details) - USD ($) $ in Millions		Mar. 31, 2016	Dec. 31, 2015
Segment Reporting, Asset Reconciling Item [Line Items]
Assets		$ 12,595	$ 12,809
Operating Segments | East
Segment Reporting, Asset Reconciling Item [Line Items]
Assets		10,950	11,430
Operating Segments | West
Segment Reporting, Asset Reconciling Item [Line Items]
Assets		1,240	1,231
Other
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	[1]	$ 405	$ 148
[1] Primarily consists of unallocated items, including cash and PP&E.

X

- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.18)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 12
-Article 7

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- Definition

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+ References

No definition available.

+ Details

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