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Earnings Per Share (Schedule Of Basic And Diluted Earnings Per Share) (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Antidilutive stock options outstanding 3,404,672 3,783,574 3,457,769 3,804,671
Net income (loss) $ 7 $ 444 $ 598 $ (693)
Basic weighted average shares 193,879,994 [1] 195,612,615 [1] 193,760,654 [1] 198,262,715 [1]
Stock options 1,097,648 734,887 1,074,883  
Diluted weighted average shares 194,977,642 196,347,502 194,835,537 198,262,715
Basic $ 0.04 $ 2.27 $ 3.09 $ (3.50)
Diluted $ 0.04 $ 2.26 $ 3.07 $ (3.50)
Unvested restricted stock and units that receive nonforfeitable dividends or dividend equivalents 5,524,396 5,038,788 5,442,143 5,085,256
[1] Includes 5,524,396 and 5,038,788 of unvested restricted stock and units that receive nonforfeitable dividends or dividend equivalents for the three months ended September 30, 2012 and 2011, respectively. Includes 5,442,143 and 5,085,256 of unvested restricted stock and units that receive nonforfeitable dividends or dividend equivalents for the nine months ended September 30, 2012 and 2011, respectively.