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Short-Term Borrowings and Borrowing Arrangements (Details)
3 Months Ended 12 Months Ended
Sep. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Short-term Debt [Line Items]      
Short-term borrowings   $ 0 $ 0
Ratio of debt to consolidated EBITDA   1.4  
Ratio of consolidated EBITDA to consolidated interest expense   11.7  
Credit Agreement [Member] | Revolving Credit Facility [Member]      
Short-term Debt [Line Items]      
Credit line available under the credit agreement   $ 3,000,000,000  
Maximum borrowing capacity $ 3,000,000,000 $ 3,000,000,000  
Term of debt 5 years    
Credit Agreement [Member] | Revolving Credit Facility [Member] | Maximum [Member]      
Short-term Debt [Line Items]      
Ratio of debt to consolidated EBITDA   3  
Credit Agreement [Member] | Revolving Credit Facility [Member] | Minimum [Member]      
Short-term Debt [Line Items]      
Ratio of consolidated EBITDA to consolidated interest expense   4  
Credit Agreement [Member] | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]      
Short-term Debt [Line Items]      
Interest rate for borrowing   1.25%