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Borrowings - Pre-Swap Obligations (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Pre-swap annual contractual obligations of long-term debt outstanding    
Remainder of 2021 $ 4,060  
2022 6,826  
2023 4,928  
2024 6,442  
2025 4,144  
Thereafter 30,625  
Total $ 57,025 $ 62,013