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Consolidated Statement Of Retained Earnings (Unaudited) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Retained earnings at beginning of period $ 2,852 $ 3,645 $ 2,600 $ 4,071
Net (loss) earnings (224) (299) 59 (665)
Loss from issuance of treasury stock     (31) (60)
Retained earnings at end of period $ 2,628 $ 3,346 $ 2,628 $ 3,346