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Businesses, Developments, Risks And Uncertainties (Schedule Of Error Corrections And Prior Period Adjustments, Statement Of Operation) (Details) (USD $)
In Millions, except Per Share data
 3 Months Ended 6 Months Ended 3 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Mar. 31, 2011
Balance As Reported [Member]
Mar. 31, 2011
Correction Of Error [Member]
Mar. 31, 2011
Balance As Revised [Member]
Unrealized gains (losses) on insured derivatives $ 116 $ 1,538 $ (1,307) $ (674) $ (1,323) $ (99) $ (1,422)
Net change in fair value of insured derivatives         (1,677) (99) (1,776)
Net gains (losses) on financial instruments at fair value and foreign exchange (103) (2) (127) (48) 1 (108) (107)
Total revenues 98 2,077 (1,510) 221 (1,400) (207) (1,607)
Income (loss) before income taxes (147) 1,968 (1,910) (291) (1,556) (207) (1,763)
Provision (benefit) for income taxes (284) 673 (772) (106) (419) (70) (489)
Net income (loss) $ 137 $ 1,295 $ (1,138) $ (185) $ (1,137) $ (137) $ (1,274)
Basic $ 0.69 $ 6.34 $ (5.70) $ (0.90) $ (5.68) $ (0.69) $ (6.37)
Diluted $ 0.68 $ 6.32 $ (5.70) $ (0.90) $ (5.68) $ (0.69) $ (6.37)