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- Credit Facilities (Narrative) (Details) - USD ($)
1 Months Ended
Jan. 31, 2012
May 31, 2016
Dec. 31, 2016
May 27, 2016
Credit Facility Due January 2017 [Member]        
Line of Credit Facility [Line Items]        
Debt Instrument, Term 5 years      
Line of Credit Facility, Maximum Borrowing Capacity $ 1,300,000,000      
Line of Credit Facility, Amount Outstanding     $ 0  
Credit Facility Due May 2021 [Member]        
Line of Credit Facility [Line Items]        
Debt Instrument, Term   5 years    
Line of Credit Facility, Maximum Borrowing Capacity       $ 2,500,000,000
Line of Credit Facility, Amount Outstanding     $ 0