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Borrowings - Contractual Maturities (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Contractual maturities of long-term debt    
2020 (Q3-Q4) $ 3,999  
2021 5,967  
2022 2,723  
2023 1,572  
2024 272  
2025 and beyond 76  
Total 14,609  
Debt    
Contractual maturities of long-term debt    
2020 (Q3-Q4) 1,702  
2021 3,135  
2022 609  
2023 786  
2024 5  
2025 and beyond 0  
Total 6,239 $ 6,495
Debt payable to IBM    
Contractual maturities of long-term debt    
2020 (Q3-Q4) 2,297  
2021 2,832  
2022 2,113  
2023 786  
2024 267  
2025 and beyond 75  
Total $ 8,370