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Long-Term Debt - (Narrative) (Details)
3 Months Ended
Jul. 25, 2017
USD ($)
Jul. 10, 2017
USD ($)
Mar. 15, 2017
USD ($)
Mar. 31, 2018
USD ($)
Jul. 31, 2017
GBP (£)
Jul. 31, 2017
EUR (€)
Jul. 10, 2017
GBP (£)
Jul. 10, 2017
£ / $
Jul. 10, 2017
EUR (€)
Jul. 10, 2017
€ / $
Debt Instrument                    
Currency conversion rate               1.27   1.12
Unamortized discount (premium), net       $ 29,000,000            
Debt issuance cost       50,000,000            
Fair value aggregate difference       14,000,000            
Senior notes                    
Debt Instrument                    
Senior notes amount             £ 300,000,000   € 1,000,000,000  
Proceeds from issuance of senior debt   $ 1,491,000,000                
Amount redeemed $ 2,000,000,000                  
Weighted average interest rate 4.00%                  
Revolving loan                    
Debt Instrument                    
Credit facility outstanding amount       475,000,000            
Borrowing capacity remaining       $ 2,519,000,000            
Weighted average interest rate       2.73%            
Revolving loan | Letter of credit                    
Debt Instrument                    
Credit facility outstanding amount       $ 6,000,000            
Revolving loan | Senior notes                    
Debt Instrument                    
Repayments of revolving loan $ 469,000,000                  
Revolving loan | FIS Credit Agreements                    
Debt Instrument                    
Total committed capital, credit agreement       $ 3,000,000,000            
Senior Notes due March 2022, interest payable semi-annually at 5.000% | Senior notes                    
Debt Instrument                    
Debt instrument, stated percentage     5.00%              
Amount redeemed     $ 700,000,000              
Percentage of principal amount redeemed     100.00%              
Loss on extinguishment of debt     $ 25,000,000              
Senior notes, Euro notes due 2021, interest payable at 0.400% | Senior notes                    
Debt Instrument                    
Senior notes amount | €           € 500,000,000     500,000,000  
Debt instrument, stated percentage   0.40%                
Senior notes, GBP notes due 2022, interest payable at 1.700%                    
Debt Instrument                    
Senior notes amount | £         £ 300,000,000          
Senior notes, GBP notes due 2022, interest payable at 1.700% | Senior notes                    
Debt Instrument                    
Senior notes amount | £             £ 300,000,000      
Debt instrument, stated percentage   1.70%                
Senior notes, Euro notes due 2024, interest payable at 1.100% | Senior notes                    
Debt Instrument                    
Senior notes amount | €           € 500,000,000     € 500,000,000  
Debt instrument, stated percentage   1.10%                
Senior Notes due October 2020, interest payable semi-annually at 3.625%                    
Debt Instrument                    
Debt instrument, stated percentage       3.625%            
Senior Notes due October 2020, interest payable semi-annually at 3.625% | Senior notes                    
Debt Instrument                    
Debt instrument, stated percentage 3.625%                  
Amount redeemed $ 600,000,000                  
Senior Notes due October 2025, interest payable semi-annually at 5.000% | Senior notes                    
Debt Instrument                    
Debt instrument, stated percentage 5.00%                  
Amount redeemed $ 600,000,000                  
Senior Notes due October 2022, interest payable semi-annually at 4.500%                    
Debt Instrument                    
Debt instrument, stated percentage       4.50%            
Senior Notes due October 2022, interest payable semi-annually at 4.500% | Senior notes                    
Debt Instrument                    
Debt instrument, stated percentage 4.50%                  
Amount redeemed $ 200,000,000                  
Senior Notes due June 2024, interest payable semi-annually at 3.875%                    
Debt Instrument                    
Debt instrument, stated percentage       3.875%            
Senior Notes due June 2024, interest payable semi-annually at 3.875% | Senior notes                    
Debt Instrument                    
Debt instrument, stated percentage 3.875%                  
Amount redeemed $ 300,000,000                  
Senior Notes due April 2023, interest payable semi-annually at 3.500%                    
Debt Instrument                    
Debt instrument, stated percentage       3.50%            
Senior Notes due April 2023, interest payable semi-annually at 3.500% | Senior notes                    
Debt Instrument                    
Debt instrument, stated percentage 3.50%                  
Amount redeemed $ 300,000,000                  
Senior Notes due April 2018, interest payable semi-annually at 2.000%                    
Debt Instrument                    
Debt instrument, stated percentage       2.00%            
Senior Notes due April 2018, interest payable semi-annually at 2.000% | Senior notes                    
Debt Instrument                    
Percentage of redemption price       100.00%            
Senior Notes due October 2018, interest payable semi-annually at 2.850%                    
Debt Instrument                    
Debt instrument, stated percentage       2.85%            
Senior Notes due August 2021, interest payable semi-annually at 2.250%                    
Debt Instrument                    
Debt instrument, stated percentage       2.25%            
Senior Euro Notes due January 2021, interest payable annually at 0.400%                    
Debt Instrument                    
Debt instrument, stated percentage       0.40%            
Senior GBP Notes due June 2022, interest payable annually at 1.700%                    
Debt Instrument                    
Debt instrument, stated percentage       1.70%            
Senior Euro Notes due July 2024, interest payable annually at 1.100%                    
Debt Instrument                    
Debt instrument, stated percentage       1.10%            
Senior Notes due October 2025, interest payable semi-annually at 5.000%                    
Debt Instrument                    
Debt instrument, stated percentage       5.00%            
Senior Notes due August 2026, interest payable semi-annually at 3.000%                    
Debt Instrument                    
Debt instrument, stated percentage       3.00%            
Senior Notes due August 2046, interest payable semi-annually at 4.500%                    
Debt Instrument                    
Debt instrument, stated percentage       4.50%            
Minimum | Senior Notes due October 2020, interest payable semi-annually at 3.625%                    
Debt Instrument                    
Percentage of redemption price       100.00%            
Trigger price, period prior to maturity       1 month            
Minimum | Senior Notes due October 2022, interest payable semi-annually at 4.500%                    
Debt Instrument                    
Percentage of redemption price       100.00%            
Trigger price, period prior to maturity       2 months            
Minimum | Senior Notes due June 2024, interest payable semi-annually at 3.875%                    
Debt Instrument                    
Percentage of redemption price       100.00%            
Trigger price, period prior to maturity       3 months            
Minimum | Senior Notes due April 2023, interest payable semi-annually at 3.500%                    
Debt Instrument                    
Percentage of redemption price       100.00%            
Trigger price, period prior to maturity       3 months            
Minimum | Senior Notes due October 2018, interest payable semi-annually at 2.850%                    
Debt Instrument                    
Percentage of redemption price       100.00%            
Minimum | Senior Notes due August 2021, interest payable semi-annually at 2.250%                    
Debt Instrument                    
Percentage of redemption price       100.00%            
Trigger price, period prior to maturity       1 month            
Minimum | Senior Euro Notes due January 2021, interest payable annually at 0.400%                    
Debt Instrument                    
Percentage of redemption price       100.00%            
Trigger price, period prior to maturity       1 month            
Minimum | Senior GBP Notes due June 2022, interest payable annually at 1.700%                    
Debt Instrument                    
Percentage of redemption price       100.00%            
Trigger price, period prior to maturity       1 month            
Minimum | Senior Euro Notes due July 2024, interest payable annually at 1.100%                    
Debt Instrument                    
Percentage of redemption price       100.00%            
Trigger price, period prior to maturity       3 months            
Minimum | Senior Notes due October 2025, interest payable semi-annually at 5.000%                    
Debt Instrument                    
Percentage of redemption price       100.00%            
Trigger price, period prior to maturity       3 months            
Minimum | Senior Notes due August 2026, interest payable semi-annually at 3.000%                    
Debt Instrument                    
Percentage of redemption price       100.00%            
Trigger price, period prior to maturity       3 months            
Minimum | Senior Notes due August 2046, interest payable semi-annually at 4.500%                    
Debt Instrument                    
Percentage of redemption price       100.00%            
Trigger price, period prior to maturity       6 months