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Income Taxes (Income Tax Expense (Benefit) On Income (Loss) And Shareholders' Equity) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Income Taxes [Abstract] |  |  |
Federal - Current taxes | $ (1) | $ 91 | $ (488)
State - Current taxes | 1 | (17) | 5
Foreign - Current taxes | 15 | (1) | (25)
Federal - Deferred taxes | (919) | (239) | 1,046
State - Deferred taxes | 0 |  |
Foreign - Deferred taxes | (16) | 18 | 45
Provision (benefit) for income taxes | (920) | (148) | 583
Total adjustments due to the adoption of new accounting standards |  | (21) | (3)
Change in unrealized gains and losses on investments | 119 | 112 | 526
Change in other-than-temporary impairment losses | 3 | (4) | (50)
Change in fair value of derivative instruments | 3 | (7) | 46
Change in foreign currency translation | (1) | 2 | 4
Share-based compensation | 4 | 3 | 5
Total income taxes charged (credited) to shareholders' equity | 128 | 85 | 528
Total effect of income taxes | $ (792) | $ (63) | $ 1,111

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