Borrowing Arrangements - Narrative (Details)
4 Months Ended
Dec. 31, 2015
USD ($)
Aug. 17, 2015
USD ($)
renewal_option
Line of Credit Facility [Line Items]    
Debt Instrument, Number of Additional Term Renewals | renewal_option   2
Debt Instrument, Duration of Renewal Option 6 months  
Line of Credit Facility, Accordion Feature, Higher Borrowing Capacity Option   $ 2,500,000,000
Revolving Credit Facility    
Line of Credit Facility [Line Items]    
Debt Instrument, Face Amount   600,000,000
Debt Instrument, Term (in years) 4 years  
Debt Instrument, Interest Rate, Stated Percentage 1.30%  
Line of Credit Facility, Remaining Borrowing Capacity $ 457,000,000  
Term Loans, Matures August 2017    
Line of Credit Facility [Line Items]    
Debt Instrument, Face Amount   600,000,000
Term Loans, Matures August 2020    
Line of Credit Facility [Line Items]    
Debt Instrument, Face Amount   $ 800,000,000
Unsecured term loan    
Line of Credit Facility [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 1.50%