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Gains and Losses Included in Net Income from Assets and Liabilities Recorded at Fair Value (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Fair Value Of Financial Instruments [Abstract]        
Total realized and unrealized gains (losses) included in net income (loss), Assets, Net investment income $ 8 $ 7 $ 22 $ 18
Total realized and unrealized gains (losses) included in net income (loss), Assets, Net investment gains (losses) (18) 28 (45) 1
Total realized and unrealized gains (losses) Included in net income (loss), Assets (10) 35 (23) 19
Total gains (losses) included in net income (loss) attributable to assets still held, Assets, Net investment income 4 7 17 19
Total gains (losses) included in net income (loss) attributable to assets still held, Assets, Net investment gains (losses) (19) 6 (40) (22)
Total gains (losses) included in net income (loss) attributable to assets still held, Assets (15) 13 (23) (3)
Total realized and unrealized (gains) losses included in net (income) loss, Liabilities, Net investment income            
Total realized and unrealized (gains) losses included in net (income) loss, Liabilities, Net investment (gains) losses (118) 611 (202) 588
Total realized and unrealized (gains) losses included in net (income) loss, Liabilities (118) 611 (202) 588
Total (gains) losses included in net (income) loss attributable to liabilities still held, Liabilities, Net investment income            
Total (gains) losses included in net (income) loss attributable to liabilities still held, Liabilities, Net investment (gains) losses (116) 611 (200) 588
Total (gains) losses included in net (income) loss attributable to liabilities still held, Liabilities $ (116) $ 611 $ (200) $ 588