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Indebtedness (Narrative) (Details) - USD ($)
Oct. 01, 2017
Sep. 30, 2017
Jan. 27, 2017
Dec. 31, 2016
Line of Credit Facility [Line Items]        
Short-term borrowings, carrying value   $ 2,905,000,000   $ 643,000,000
Committed credit facilities   8,000,000,000    
Borrowings under committed credit facilities   0    
Revolving Credit Expiring February 6, 2018 [Member]        
Line of Credit Facility [Line Items]        
Committed credit facilities   $ 2,000,000,000 $ 2,000,000,000  
Subsequent Event [Member] | Multi-year revolving credit, expiring October 1, 2022 [Member]        
Line of Credit Facility [Line Items]        
Committed credit facilities $ 3,500,000,000