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Lease Commitments - Cash Paid (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Leases [Abstract]    
Operating cash flows from operating leases $ 1,744 $ 1,574
Investing cash flows from operating leases 762 1,047
Operating cash flows from finance leases 14 13
Financing cash flows from finance leases $ 34 $ 24