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Loans, borrowings, leases, cash and cash equivalents and short-term investments - Debt payments (Details)
$ in Millions
Dec. 31, 2020
USD ($)
Loans and borrowings  
Principal $ 13,159
Estimated future interest payments 6,913
2021  
Loans and borrowings  
Principal 685
Estimated future interest payments 637
2022  
Loans and borrowings  
Principal 1,230
Estimated future interest payments 610
2023  
Loans and borrowings  
Principal 1,229
Estimated future interest payments 581
2024  
Loans and borrowings  
Principal 2,024
Estimated future interest payments 527
Between 2025 and 2029  
Loans and borrowings  
Principal 2,175
Estimated future interest payments 2,108
2030 onwards  
Loans and borrowings  
Principal 5,816
Estimated future interest payments $ 2,450