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Incentive Stock Program - Expense (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Incentive Stock Programs      
Total non-cash compensation expense charged against income $ 546 $ 519 $ 477
Tax benefit recognized in total non-cash compensation expense $ 200 $ 197 $ 185