Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2012	Dec. 31, 2011
Deferred tax assets/liabilities, net
Net deferred tax liability, consolidated	$ 261
Net deferred tax asset	18	19
Net deferred tax liability	279	147
Percent of total permanent tax differences related to investment revenues (as a percent)	99.00%
Indemnity
Deferred tax assets/liabilities, net
Net deferred tax asset	18	19
Effective tax rate when investment related permanent tax differences are excluded (as a percent)	35.00%
Exchange
Deferred tax assets/liabilities, net
Net deferred tax liability	$ 279	$ 147
Effective tax rate when investment related permanent tax differences are excluded (as a percent)	35.00%

The cumulative amount for all deferred tax liabilities as of the balance sheet date arising from temporary differences between accounting income in accordance with generally accepted accounting principles and tax-basis income that will result in future taxable income exceeding future accounting income.

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For entities that net deferred tax assets and tax liabilities, represents the unclassified net amount of deferred tax assets and liabilities as of the balance sheet date, which result from applying the applicable enacted tax rate to net temporary differences and carryforwards pertaining to assets or liabilities. A temporary difference is a difference between the tax basis of an asset or liability and its carrying amount in the financial statements prepared in accordance with generally accepted accounting principles that will reverse in ensuing periods.

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