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Cash Flow Information (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Supplemental Cash Flow Elements [Abstract]    
Interest paid $ 533 $ 548
Income taxes paid 555 143
Distribution of nonmonetary assets 0 726
Software obtained under financing arrangements 143 130
Right-of-use assets obtained in exchange for lease liabilities - operating leases 75 2
Right-of-use assets obtained in exchange for lease liabilities - finance leases $ 183 $ 331