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Borrowings - Pre-Swap Obligations (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Pre-swap annual contractual obligations of long-term debt outstanding    
Remainder of 2021 $ 1,189  
2022 6,889  
2023 4,973  
2024 6,497  
2025 4,142  
Thereafter 30,526  
Total $ 54,216 $ 62,013