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Income Tax - Gross Deferred Tax Assets on Tax Loss Carryforwards and Investment Credits Expiration (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
2013	$ 7
2014	7
2015	14
2016	35
2017	13
Thereafter	744
Total	$ 820	$ 643

X

- Definition

Deferred tax assets on tax loss carryforwards and investment credits expiration Thereafter.

+ References

No definition available.

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- Definition

Deferred Tax Assets On Tax Loss Carryforwards And Investment Credits Expiration Year Five

+ References

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- Definition

Deferred tax assets on tax loss carryforwards and investment credits expiration Year Four.

+ References

No definition available.

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- Definition

Deferred tax assets on tax loss carryforwards and investment credits expiration.

+ References

No definition available.

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- Definition

Deferred tax assets on tax loss carryforwards and investment credits expiration Year Three.

+ References

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- Definition

Deferred tax assets on tax loss carryforwards and investment credits expiration Year Two.

+ References

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- Definition

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 25

-Paragraph 20

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6969291&loc=d3e28680-109314



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 6

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319



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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 109

-Paragraph 43, 289

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 740

-SubTopic 10

-Section 50

-Paragraph 8

-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319

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