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Reconciliation of the Expected Income Tax Expense at the Statutory Federal Income Tax Rate to the Actual Income Tax Expense/(Benefit) and Effective Tax Rate (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Income tax expense/(benefit) at federal statutory rate $ 254 $ 1 $ (861)
Increase (decrease) resulting from:      
Tax-exempt interest (72) (74) (79)
Dividends received deduction (14) (13) (12)
Income tax credits, net (88) (88) (80)
State income taxes, net 2 12 (48)
Completion of audit examinations by taxing authorities 0 (20) (55)
Goodwill impairment 0 0 237
Other (3) (3) 0
Total income tax benefit $ 79 $ (185) $ (898)
Income tax expense/(benefit) at federal statutory rate 35.00% 35.00% (35.00%)
Increase (decrease) resulting from:      
Tax-exempt interest (9.90%)    (3.20%)
Dividends received deduction (1.90%)    (0.50%)
Income tax credits, net (12.10%)    (3.20%)
State income taxes, net 0.20%    (2.00%)
Completion of audit examinations by taxing authorities 0.00%    (2.20%)
Goodwill impairment 0.00% 0.00% 9.60%
Other (0.40%)    0.00%
Total income tax benefit and rate 10.90%    (36.50%)