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Leases (Components of Lease Expense) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Leases [Abstract]        
Operating lease cost $ 1,546 $ 1,481 $ 4,372 $ 4,333
Finance lease cost:        
Amortization of right-of-use assets 76 67 216 203
Interest on lease obligation 39 42 116 126
Total finance lease cost $ 115 $ 109 $ 332 $ 329