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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Income Tax Disclosure [Abstract]          
Estimated annual effective tax rate (as a percent)     26.00% 31.00% 28.00%
Income Tax Disclosure          
Tax benefit for settlement of stock-based compensation awards     $ 60 $ 8  
Income tax (expense) benefit reported discretely in the period and excluded from the estimated annual effective tax rate       (22)  
Gain (loss) on remeasurement of pension obligations   $ (122) 0 132  
Foreign Plan          
Income Tax Disclosure          
Gain (loss) on remeasurement of pension obligations $ 0 $ (120) 0 $ 134  
Tax Year Prior Years          
Income Tax Contingency          
Income tax examination, proposed liability increase/(decrease) $ 2,300   $ 2,300