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Borrowings - Pre-Swap Obligations (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Pre-swap annual contractual obligations of long-term debt outstanding    
Remainder of 2021 $ 2,470  
2022 6,862  
2023 5,016  
2024 6,498  
2025 4,219  
Thereafter 30,734  
Total $ 55,800 $ 62,013