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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Income Tax Disclosure [Abstract]          
Estimated annual effective tax rate (as a percent)     25.00% 31.00% 28.00%
Income Tax Disclosure          
Tax benefit for settlement of stock-based compensation awards     $ 61 $ 21  
Prior year tax adjustment expense (benefit)     (36) (80)  
Income tax (expense) benefit reported discretely in the period and excluded from the estimated annual effective tax rate       (10)  
Gain (loss) on remeasurement of pension obligations   $ (77) 0 55  
Foreign Plan          
Income Tax Disclosure          
Gain (loss) on remeasurement of pension obligations $ 0 $ (79) 0 $ 55  
Tax Year Prior Years          
Income Tax Contingency          
Income tax examination, proposed liability increase/(decrease) $ 2,300   $ 2,300