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Debt (Senior Notes - Narrative) (Details) - USD ($)
$ in Millions
1 Months Ended
Jul. 31, 2016
Feb. 29, 2016
Jan. 31, 2015
Jun. 30, 2019
Jul. 31, 2018
Senior Notes | LIBOR          
Debt Instrument [Line Items]          
Incremental increase in basis points resulting from downgrades     0.25%    
Incremental decrease in basis points resulting from upgrades     0.25%    
Increase in basis spread 1.75% 1.75%      
4.05% Senior Notes due January 2020 | Long-term debt          
Debt Instrument [Line Items]          
Senior notes     $ 850    
Stated interest rate 5.80%   4.05% 6.05% 5.30%
4.05% Senior Notes due January 2020 | Senior Notes          
Debt Instrument [Line Items]          
Stated interest rate       4.05%  
4.95% Senior Notes due January 2025 | Long-term debt          
Debt Instrument [Line Items]          
Senior notes     $ 1,000    
Stated interest rate 6.70%   4.95% 6.95% 6.20%
4.95% Senior Notes due January 2025 | Senior Notes          
Debt Instrument [Line Items]          
Stated interest rate       4.95%