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Income Taxes (Income Tax Expense (Benefit) On Income (Loss) And Shareholders' Equity) (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Federal - Current taxes | $ 3 | $ (1) | $ 91
State - Current taxes | 2 | 1 | (17)
Foreign - Current taxes | (6) | 15 | (1)
Federal - Deferred taxes | 350 | (919) | (239)
Foreign - Deferred taxes | 15 | (16) | 18
Provision (benefit) for income taxes | 364 | (920) | (148)
Total adjustments due to the adoption of new accounting standards |  |  | (21)
Change in unrealized gains and losses on investments | 75 | 119 | 112
Change in other-than-temporary impairment losses | 42 | 3 | (4)
Change in fair value of derivative instruments | 11 | 3 | (7)
Change in foreign currency translation | (2) | (1) | 2
Share-based compensation | 7 | 4 | 3
Total income taxes charged (credited) to shareholders' equity | 133 | 128 | 85
Total effect of income taxes | $ 497 | $ (792) | $ (63)

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