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Lease Commitments - Lease Cost (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Leases [Abstract]      
Operating lease costs $ 2,199 $ 2,551 $ 2,621
Finance lease costs 66 45 66
Total lease costs $ 2,265 $ 2,596 $ 2,687