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Debt - Short Term Borrowing and Commercial Paper Program (Details) - USD ($)
Dec. 31, 2019
Dec. 31, 2018
Jul. 31, 2018
Line of Credit Facility [Line Items]      
Facility Capacity $ 15,000,000,000    
Principal Amount Outstanding 4,471,000,000    
Commercial paper 0 $ 0  
Short Term Facility      
Line of Credit Facility [Line Items]      
Facility Capacity     $ 700,000,000
Principal Amount Outstanding $ 0 $ 0