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Long Term Debt and Other Borrowings - Senior Notes Narrative (Detail) - Senior notes - USD ($)
Jun. 07, 2016
Mar. 12, 2015
Jun. 26, 2016
Oct. 20, 2015
Mar. 31, 2015
Debt Instrument [Line Items]          
Principal amount       $ 2,400,000,000 $ 1,000,000,000
2.75% Notes due 2020          
Debt Instrument [Line Items]          
Principal amount   $ 500,000,000      
Interest rate percentage   2.75% 2.75%    
Percentage of principal amount of debt redeemed   100.00%      
Debt instrument, redemption price (percentage)   101.00%      
3.80% Notes due 2025          
Debt Instrument [Line Items]          
Principal amount   $ 500,000,000      
Interest rate percentage   3.80% 3.80%    
Percentage of principal amount of debt redeemed   100.00%      
Debt instrument, redemption price (percentage)   101.00%      
2.80 Notes due 2021          
Debt Instrument [Line Items]          
Principal amount $ 800,000,000        
Interest rate percentage 2.80%   2.80%    
Percentage of principal amount of debt redeemed 100.00%        
Debt instrument, redemption price (percentage) 101.00%        
Special Mandatory Redemption Event, days to notify note holders 5 days        
Special Mandatory Redemption Date, days after notice 3 days        
3.45% Notes due 2023          
Debt Instrument [Line Items]          
Principal amount $ 600,000,000        
Interest rate percentage 3.45%   3.45%    
Percentage of principal amount of debt redeemed 100.00%        
Debt instrument, redemption price (percentage) 101.00%        
3.90% Notes due 2026          
Debt Instrument [Line Items]          
Principal amount $ 1,000,000,000        
Interest rate percentage 3.90%   3.90%    
Percentage of principal amount of debt redeemed 100.00%        
Debt instrument, redemption price (percentage) 101.00%