Income Taxes	3 Months Ended
Mar. 31, 2012
Income Taxes [Abstract]
Income Taxes	10. Income Taxes Income Tax Provision In accordance with the applicable accounting guidance, the principal method established for computing the provision for income taxes in interim periods requires us to make our best estimate of the effective tax rate expected to be applicable for the full year. This estimated effective tax rate is then applied to interim consolidated pre-tax operating income to determine the interim provision for income taxes. Additionally, the accounting guidance allows for an alternative method to computing the effective tax rate and, thus the interim provision for income taxes, when a taxpayer is unable to calculate a reliable estimate of the effective tax rate for the entire year. For the first quarter of 2012, we applied an estimated annual effective rate to the interim period’s consolidated pre-tax operating income. For prior interim periods beginning with the quarter ended June 30, 2010, we applied the alternative method allowed under the accounting guidance. The provision for the prior quarters is calculated by applying the statutory federal income tax rate to the quarter’s consolidated operating income before taxes after modifications. These items include modifications for non-taxable items recognized in the quarter, which include income from corporate-owned life insurance, tax credits related to investments in low-income housing projects, and state taxes. During those periods, we concluded that the uncertainty of the economic environment made the alternative method more reliable in determining the tax provision for those periods. The effective tax rate, which is the provision for income taxes as a percentage of income from continuing operations before income taxes, was 27.0% for the first quarter of 2012, 25.0% for the fourth quarter of 2011, and 28.2% for the first quarter of 2011. The effective tax rates are below our combined federal and state statutory tax rate of 37.2%, due primarily to income from investments in tax-advantaged assets such as corporate-owned life insurance and credits associated with investments in low-income housing projects. Deferred Tax Asset At March 31, 2012, from continuing operations, we had a federal deferred tax asset of $81 million and a state deferred tax liability of $23 million compared to a federal deferred tax asset of $111 million and a state deferred tax liability of $19 million at December 31, 2011, and a combined federal and state deferred tax asset of $348 million at March 31, 2011, included in “accrued income and other assets” on the balance sheet. To determine the amount of deferred tax assets that are more-likely-than-not to be realized, and therefore recorded, we conduct a quarterly assessment of all available evidence. This evidence includes, but is not limited to, taxable income in prior periods, projected future taxable income, and projected future reversals of deferred tax items. Based on these criteria, and in particular our expectations for future taxable income, we currently believe that it is more-likely-than-not that we will realize the net deferred tax asset in future periods. Unrecognized Tax Benefits As permitted under the applicable accounting guidance for income taxes, it is our policy to recognize interest and penalties related to unrecognized tax benefits in income tax expense.

Income Taxes

3 Months Ended

Mar. 31, 2012

10. Income Taxes

Income Tax Provision

In accordance with the applicable accounting guidance, the principal method established for computing the provision for income taxes in interim periods requires us to make our best estimate of the effective tax rate expected to be applicable for the full year. This estimated effective tax rate is then applied to interim consolidated pre-tax operating income to determine the interim provision for income taxes. Additionally, the accounting guidance allows for an alternative method to computing the effective tax rate and, thus the interim provision for income taxes, when a taxpayer is unable to calculate a reliable estimate of the effective tax rate for the entire year. For the first quarter of 2012, we applied an estimated annual effective rate to the interim period’s consolidated pre-tax operating income. For prior interim periods beginning with the quarter ended June 30, 2010, we applied the alternative method allowed under the accounting guidance. The provision for the prior quarters is calculated by applying the statutory federal income tax rate to the quarter’s consolidated operating income before taxes after modifications. These items include modifications for non-taxable items recognized in the quarter, which include income from corporate-owned life insurance, tax credits related to investments in low-income housing projects, and state taxes. During those periods, we concluded that the uncertainty of the economic environment made the alternative method more reliable in determining the tax provision for those periods.

The effective tax rate, which is the provision for income taxes as a percentage of income from continuing operations before income taxes, was 27.0% for the first quarter of 2012, 25.0% for the fourth quarter of 2011, and 28.2% for the first quarter of 2011. The effective tax rates are below our combined federal and state statutory tax rate of 37.2%, due primarily to income from investments in tax-advantaged assets such as corporate-owned life insurance and credits associated with investments in low-income housing projects.

Deferred Tax Asset

At March 31, 2012, from continuing operations, we had a federal deferred tax asset of $81 million and a state deferred tax liability of $23 million compared to a federal deferred tax asset of $111 million and a state deferred tax liability of $19 million at December 31, 2011, and a combined federal and state deferred tax asset of $348 million at March 31, 2011, included in “accrued income and other assets” on the balance sheet. To determine the amount of deferred tax assets that are more-likely-than-not to be realized, and therefore recorded, we conduct a quarterly assessment of all available evidence. This evidence includes, but is not limited to, taxable income in prior periods, projected future taxable income, and projected future reversals of deferred tax items. Based on these criteria, and in particular our expectations for future taxable income, we currently believe that it is more-likely-than-not that we will realize the net deferred tax asset in future periods.

Unrecognized Tax Benefits

As permitted under the applicable accounting guidance for income taxes, it is our policy to recognize interest and penalties related to unrecognized tax benefits in income tax expense.