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Borrowings and Lines of Credit (ST Borrowings Narrative) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Debt Disclosure [Abstract]    
Maximum Commercial Paper Borrowing Authority $ 6,350  
Short Term Line of Credit Facilities Remaining Borrowing Capacities $ 2,300  
Short Term Debt Weighted Average Interest Rate, Avg Outstanding 1.90% 1.50%
Total Debt Weighted Average Interest Rate, Avg Outstanding 3.70% 3.50%
Short Term Debt Weighted Average Interest Rate, Outstanding 3.10% 1.20%
Total Debt Weighted Average Interest Rate, Outstanding 3.70% 3.50%
Line of Credit Facility [Line Items]    
Aggregate Line of Credit Facility Maximum Borrowing Capacity $ 10,350  
Multicurrency Revolving Credit Agreement [Member]    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity 2,150  
Revolving Credit Agreement [Member]    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity $ 2,200