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Income Taxes - Components of Income Before Income Taxes (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
United States $ 1,317 $ 1,050 $ 1,175
International 2,330 2,251 2,289
Income before income taxes $ 3,647 $ 3,301 $ 3,464