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Derivative Financial Instruments - Narrative (Details)
1 Months Ended 3 Months Ended
Jun. 30, 2015
USD ($)
contract
Mar. 31, 2014
USD ($)
contract
Jan. 31, 2010
USD ($)
contract
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Derivative Financial Instruments          
Number of interest rate swap contracts entered into by company | contract 2 3 2    
Derivative assets       $ 15,000,000 $ 22,000,000
Derivative liabilities       6,000,000 7,000,000
Fair value swap adjustment       9,000,000 14,000,000
Impact to earnings related to the ineffective portion of hedging instruments       0  
Impact to earnings when a hedged firm commitment no longer qualified as a fair value hedge or when a hedged forecasted transaction no longer qualified as a cash flow hedge       0  
Amount of cash flow hedge loss to be reclassified into earnings over next 12 months       $ 0  
Maximum duration of a foreign currency cash flow hedge contract in months       66 months  
Foreign currency forward exchange contracts          
Derivative Financial Instruments          
Notional amount       $ 690,000,000 1,312,000,000
Other assets | Interest rate swaps          
Derivative Financial Instruments          
Derivative assets       10,000,000 14,000,000
Other liabilities | Interest rate swaps          
Derivative Financial Instruments          
Derivative liabilities       1,000,000 0
Long-term debt | Interest rate swaps          
Derivative Financial Instruments          
Fair value swap adjustment       9,000,000 $ 14,000,000
Other current assets | Foreign currency forward exchange contracts          
Derivative Financial Instruments          
Fair value of derivative asset not designated as hedging instrument       3,000,000  
Other current liabilities | Foreign currency forward exchange contracts          
Derivative Financial Instruments          
Fair value of derivative liability not designated as hedging instrument       $ 1,000,000  
Unsecured Debt | July 2019          
Derivative Financial Instruments          
Derivative amount of hedged item $ 150,000,000   $ 150,000,000    
Interest rate 5.25%   5.25% 5.25%  
Unsecured Debt | July 2019 | Six-month LIBOR          
Derivative Financial Instruments          
Basis spread on variable rate     1.235%    
Unsecured Debt | July 2019 | Three-month LIBOR          
Derivative Financial Instruments          
Basis spread on variable rate 3.56%        
Unsecured Debt | December 2023          
Derivative Financial Instruments          
Derivative amount of hedged item   $ 200,000,000      
Interest rate       3.70%  
Unsecured Debt | December 2023 | One-month LIBOR          
Derivative Financial Instruments          
Basis spread on variable rate   0.94%