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Income Taxes	3 Months Ended
Income Taxes	Mar. 31, 2015
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Corporation recognized income tax expense of $22 million for the first quarter of 2015, compared to income tax expense of $21 million for the comparable period in 2014. The effective tax rate was 32.49% for the first quarter of 2015, compared to an effective tax rate of 31.35% for the first quarter of 2014.

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

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