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Indebtedness (Narrative) (Details) - USD ($)
Jun. 30, 2019
Jan. 28, 2019
Dec. 31, 2018
Line of Credit Facility [Line Items]      
Short-term borrowings, carrying value $ 269,000,000   $ 730,000,000
Committed credit facilities 8,000,000,000.0    
Borrowings under committed credit facilities 0    
364-day revolving credit expiring February 4, 2020 [Member]      
Line of Credit Facility [Line Items]      
Committed credit facilities $ 2,000,000,000.0 $ 2,000,000,000.0  
2.000% Notes | US Dollar Notes [Member]      
Line of Credit Facility [Line Items]      
Interest rate 2.00%