Cumulative translation adjustment resulting from translating foreign currency financial statements into the reporting currency. Reported in equity as part of accumulated other comprehensive income.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e637-108580

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

-Publisher FASB

-Name Accounting Standards Codification

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 130

-Paragraph 23, 24, 25

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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

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Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 52

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 52

-Paragraph 13

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

+ Details

- Definition

Current period translation adjustment net of tax resulting from translating foreign currency financial statements into the reporting currency. Adjustment is reported in other comprehensive income and is not included in determining net income.

+ References+ Details

Yen/Dollar Exchange Rates Used (Detail)	12 Months Ended
Yen/Dollar Exchange Rates Used (Detail)	Dec. 31, 2011 USD ($)	Dec. 31, 2011 JPY (¥)	Dec. 31, 2010 USD ($)	Dec. 31, 2010 JPY (¥)	Dec. 31, 2009 USD ($)	Dec. 31, 2009 JPY (¥)	Dec. 31, 2011 Exchange effect on total assets USD ($)	Dec. 31, 2010 Exchange effect on total assets USD ($)	Dec. 31, 2011 Exchange effect on total liabilities USD ($)	Dec. 31, 2010 Exchange effect on total liabilities USD ($)
Segment Reporting, Other Significant Reconciling Item [Line Items]
Weighted-average yen/dollar exchange rate		¥ 79.73		¥ 87.69		¥ 93.49
Yen percent strengthening (weakening)	10.00%	10.00%	6.60%	6.60%	10.70%	10.70%
Exchange effect on net earnings	162,000,000		191,000,000		55,000,000
Yen/dollar exchange rate at December 31		77.74		81.49
Yen percent strengthening (weakening)	4.80%	4.80%	13.00%	13.00%
Exchange effect							$ 4,237,000,000	$ 9,073,000,000	$ 4,253,000,000	$ 9,104,000,000