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Borrowings - Pre-Swap Obligations (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Pre-swap annual contractual obligations of long-term debt outstanding    
Remainder of 2020 $ 4,366  
2021 6,937  
2022 7,194  
2023 5,417  
2024 6,324  
Thereafter 34,232  
Total $ 64,470 $ 62,207