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Income Taxes - Income Tax Provision and Effective Income Tax Rate (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Income Tax Disclosure [Abstract]        
Income tax provision $ 54 $ 124 $ 300 $ 176
Effective income tax rate 11.30% 32.50% 23.70% 21.10%