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Debt (Details) - USD ($)
Jun. 30, 2019
May 31, 2019
Apr. 30, 2019
Dec. 31, 2018
Debt Instrument [Line Items]        
Restricted cash $ 86,000,000     $ 88,000,000
Securitization Borrowings        
Debt Instrument [Line Items]        
Current borrowing capacity   $ 450,000,000 $ 400,000,000  
Accounts receivable securitization balance 0     $ 0
3.80% Senior Notes Due 2028 | Senior Notes        
Debt Instrument [Line Items]        
Debt instrument, face amount $ 200,000,000      
Interest rate, stated percentage 3.80%      
4.10% Senior Notes Due 2049 | Senior Notes        
Debt Instrument [Line Items]        
Debt instrument, face amount $ 400,000,000      
Interest rate, stated percentage 4.10%      
5.10% Senior Notes Due 2118 | Senior Notes        
Debt Instrument [Line Items]        
Debt instrument, face amount $ 200,000,000      
Interest rate, stated percentage 5.10%