Consolidated Statement Of Retained Earnings (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Retained earnings at beginning of period	$ 2,600	$ 4,071
Net earnings (loss)	283	(366)
Loss from issuance of treasury stock	(31)	(60)
Retained earnings at end of period	$ 2,852	$ 3,645

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Reference 7: http://www.xbrl.org/2003/role/presentationRef

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Reference 8: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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-Name Accounting Research Bulletin (ARB)

-Number 51

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-Name Accounting Research Bulletin (ARB)

-Number 51

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Reference 16: http://www.xbrl.org/2003/role/presentationRef

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+ Details