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DEBT (Details) - USD ($)
$ in Millions
2 Months Ended 3 Months Ended 6 Months Ended
May 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Nov. 30, 2019
Debt            
Net cash flow hedge gain (loss)   $ (22) $ 9 $ (24) $ 9  
2020 Senior Notes            
Debt            
Aggregate principal amount           $ 500
Interest rate, stated percentage           1.80%
2.000% Senior Notes due December 1, 2024 (the "2024 Senior Notes")            
Debt            
Aggregate principal amount           $ 500
Interest rate, stated percentage           2.00%
Price (as a percent)   99.421%   99.421%    
Yield (as a percent)   2.122%   2.122%    
Unamortized Debt Discount   $ 3   $ 3    
Debt Issuance Costs   $ 3        
2.375% Senior Notes due December 1, 2029 (the "2029 Senior Notes")            
Debt            
Aggregate principal amount           $ 650
Interest rate, stated percentage           2.375%
Price (as a percent)   99.046%   99.046%    
Yield (as a percent)   2.483%   2.483%    
Unamortized Debt Discount   $ 6   $ 6    
Debt Issuance Costs   $ 4        
2.375% Senior Notes due December 1, 2029 (the "2029 Senior Notes") | Treasury lock agreements            
Debt            
Yield (as a percent) 3.15%          
Notional amount $ 500          
Weighted-average all-in rate 2.50%          
Net cash flow hedge gain (loss) $ (33)          
3.125% Senior Notes due December 1, 2049 (the "2049 Senior Notes")            
Debt            
Aggregate principal amount           $ 650
Interest rate, stated percentage           3.125%
Price (as a percent)   98.769%   98.769%    
Yield (as a percent)   3.189%   3.189%    
Unamortized Debt Discount   $ 8   $ 8    
Debt Issuance Costs   $ 7