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Leases - Lease Cost (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Leases [Abstract]      
Operating lease cost $ 162 $ 198 $ 207
Finance lease cost      
Amortization of right-of-use assets 122 150 40
Interest on lease liabilities 23 21 8
Total lease cost 307 369 255
Variable lease cost included within operating lease cost $ 39 50 $ 56
Accelerated amortization expense included within finance lease expense   $ 62