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Cash Flow Information (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Supplemental Cash Flow Elements [Abstract]    
Interest paid $ 176 $ 205
Income taxes paid 15 25
Treasury stock purchases settled after the balance sheet date 0 41
Financed software arrangements 67 0
Right-of-use assets obtained in exchange for lease liabilities - operating leases 5 0
Right-of-use assets obtained in exchange for lease liabilities - finance leases $ 78 $ 293