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Debt - Short-Term Borrowings and Commercial Paper Program (Details) - USD ($)
3 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Apr. 30, 2020
Mar. 31, 2020
Short-term Debt [Line Items]        
Principal Amount Issued $ 2,123,000,000     $ 5,885,000,000
Principal amount outstanding 5,059,000,000      
Commercial Paper        
Short-term Debt [Line Items]        
Principal Amount Issued     $ 3,500,000,000  
Repayments of Short-term Debt 1,000,000,000.0 $ 2,500,000,000    
Commercial paper $ 0