v3.21.2
Income Taxes
 6 Months Ended
Jun. 30, 2021
Income Tax Disclosure [Abstract]  
Income Taxes Income Taxes
The following table presents our provision for income taxes (in millions, except for effective tax rate):
Three Months EndedSix Months Ended
June 30,June 30,
2020202120202021
Provision for income taxes$1,318 $3,460 $2,239 $6,813 
Effective tax rate15.9 %15.7 %14.0 %15.7 %
We are subject to income taxes in the U.S. and foreign jurisdictions. Significant judgment is required in evaluating our uncertain tax positions and determining our provision for income taxes. Our total gross unrecognized tax benefits were $3.8 billion and $4.6 billion as of December 31, 2020 and June 30, 2021, respectively. Our total unrecognized tax benefits that, if recognized, would affect our effective tax rate were $2.6 billion and $3.2 billion as of December 31, 2020 and June 30, 2021, respectively. Although the timing of the resolution, settlement, and closure of audits is not certain, we do not believe it is reasonably possible that our unrecognized tax benefits will materially change in the next 12 months.
For information regarding non-income taxes, see Note 9.