in their charts it explains this as follows: Reflects a one-time income tax benefit of $913 million related to the effects of a tax election to capitalize and

in their charts it explains this as follows: Reflects a one-time income tax benefit of $913 million related to the effects of a tax election to capitalize and amortize certain research and development expenses for U.S. income tax purposes. Excluding this tax benefit, our effective tax rate would have been 11 percentage points higher in Q3 2020.