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Borrowings - Short-Term Debt (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Short-Term Debt    
Short-term debt $ 6,184 $ 8,827
Short-term financing receivables pledged as collateral for short-term secured borrowings 169 280
Debt    
Short-Term Debt    
Short-term debt 245 633
Commercial paper    
Short-Term Debt    
Short-term debt   $ 304
Weighted-average interest rates for short-term loans (as a percent)   1.60%
Short-term loans    
Short-Term Debt    
Short-term debt $ 77 $ 49
Weighted-average interest rates for short-term loans (as a percent) 3.10% 5.20%
Secured borrowings    
Short-Term Debt    
Short-term debt $ 169 $ 280
Weighted-average interest rates for short-term loans (as a percent) 3.00% 3.60%
Debt payable to IBM    
Short-Term Debt    
Short-term debt $ 5,938 $ 8,194
Weighted-average interest rates for short-term loans (as a percent) 0.30% 1.60%