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Income Taxes
 6 Months Ended
Jun. 30, 2021
Income Tax Disclosure [Abstract]  
Income Taxes Income Taxes
For interim income tax reporting, we estimate our annual effective tax rate and apply it to our year-to-date ordinary income (loss). Tax jurisdictions with a projected or year-to-date loss for which a tax benefit cannot be realized are excluded. The tax effects of unusual or infrequently occurring items, including changes in judgment about valuation allowances and effects of changes in tax laws or rates, are reported in the interim period in which they occur.

In the three months ended June 30, 2021, Income tax expense of $971 million was primarily due to tax expense attributable to entities included in our effective tax rate calculation. In the three months ended June 30, 2020, Income tax benefit of $112 million was primarily due to tax benefit attributable to entities included in our effective tax rate calculation.

In the six months ended June 30, 2021, Income tax expense of $2.1 billion was primarily due to tax expense attributable to entities included in our effective tax rate calculation and the establishment of a valuation allowance against Cruise deferred tax assets that are considered no longer realizable. In the six months ended June 30, 2020, Income tax expense of $245 million on a pre-tax loss was primarily due to tax expense attributable to entities included in our effective tax rate calculation and the establishment of a valuation allowance against deferred tax assets.

In the six months ended June 30, 2021, Cruise issued new preferred shares to investors. As a result of the issuance in January 2021, Cruise fell below the ownership threshold required for inclusion in our U.S. consolidated income tax returns, and we established a valuation allowance of $316 million against deferred tax assets. Refer to Note 16 to our condensed consolidated financial statements for additional information regarding the Cruise preferred stock issuance.

At June 30, 2021, we had $21.7 billion of net deferred tax assets consisting of net operating losses and income tax credits, capitalized research expenditures and other timing differences that are available to offset future income tax liabilities, partially offset by valuation allowances.