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Loans, borrowings, leases, cash and cash equivalents and short-term investments - Funding (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2019
Dec. 31, 2020
Disclosure of detailed information about borrowings [line items]      
Premium paid on early redemption of debt security $ 63 $ 265  
Borrowings $ 13,782   $ 15,027