Quarterly report pursuant to Section 13 or 15(d)

Debt - (Letters of Credit & Surety Bonds) (Details)

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Debt - (Letters of Credit & Surety Bonds) (Details)
€ in Millions, $ in Millions
Sep. 30, 2017
USD ($)
Sep. 30, 2017
EUR (€)
Surety Bond    
Debt Instrument [Line Items]    
Surety bonds $ 404  
Letter of Credit    
Debt Instrument [Line Items]    
Letters of credit outstanding $ 51  
Letters of credit, effective yield (percent) 1.33% 1.33%
Letter of Credit | Ribera Salud    
Debt Instrument [Line Items]    
Borrowings outstanding $ 45 € 38