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Lease Accounting - Cash flow (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Lessee, Lease, Description [Line Items]      
Net cash provided by operating activities $ 9,555 $ 9,051 $ 11,162
Lease assets obtained in exchange for new finance lease liabilities 18 1  
Lease assets obtained in exchange for new operating lease liabilities 5 41  
Operating Leases [Member]      
Lessee, Lease, Description [Line Items]      
Net cash provided by operating activities $ (139) $ (133)