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Debt - Short-Term Borrowings and Commercial Paper Program (Details) - USD ($)
1 Months Ended 3 Months Ended
Jul. 28, 2020
Apr. 30, 2020
Jun. 30, 2020
Short-term Debt [Line Items]      
Principal amount outstanding     $ 4,206,000,000
Commercial paper     1,000,000,000.0
Short Term Facility      
Short-term Debt [Line Items]      
Repayments of Short-term Debt     700,000,000
Principal amount outstanding     0
Commercial Paper      
Short-term Debt [Line Items]      
Repayments of Short-term Debt     $ 2,500,000,000
Commercial paper issued   $ 3,500,000,000  
Commercial Paper | Subsequent Event      
Short-term Debt [Line Items]      
Repayments of Short-term Debt $ 460,000,000