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Debt - Maturities of Long-Term Debt (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Schedule of Maturities of Long-term Debt [Line Items]    
Total Principal Balance $ 1,552 $ 1,553
2016 0  
2017 0  
2018 0  
2019 0  
2020 550  
Thereafter 1,002  
5.375% Notes    
Schedule of Maturities of Long-term Debt [Line Items]    
Total Principal Balance 700 700
2016 0  
2017 0  
2018 0  
2019 0  
2020 0  
Thereafter 700  
1.125% Convertible Notes    
Schedule of Maturities of Long-term Debt [Line Items]    
Total Principal Balance 550 550
2016 0  
2017 0  
2018 0  
2019 0  
2020 550  
Thereafter 0  
1.625% Notes    
Schedule of Maturities of Long-term Debt [Line Items]    
Total Principal Balance 302 [1] $ 302
2016 [1] 0  
2017 [1] 0  
2018 [1] 0  
2019 [1] 0  
2020 [1] 0  
Thereafter [1] $ 302  
[1] The 1.625% Notes have a contractual maturity date in 2044; however, on contractually specified dates beginning in 2018, holders of the 1.625% Notes may require us to repurchase some or all of the 1.625% Notes, or we may redeem any or all of the 1.625% Notes.