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Derivatives and Currency Exchange Risk Management - Narrative (Details)
€ in Billions
12 Months Ended
Apr. 24, 2020
USD ($)
derivative
Apr. 26, 2019
USD ($)
Apr. 27, 2018
USD ($)
Apr. 24, 2020
EUR (€)
derivative
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
After-tax net unrealized gains (losses) associated with cash flow hedging instruments recorded in AOCI $ 266,000,000 $ 194,000,000    
Cash flow hedge unrealized gains to be reclassified over the next twelve months 225,000,000      
Face value of debt 24,500,000,000 25,000,000,000.0    
Gains (losses) on firm commitments that no longer qualify as fair value hedges 0 0 $ 0  
After-tax net unrealized gains (losses) associated with net investment hedging instruments recorded in AOCI 236,000,000 (169,000,000)    
Net investment hedge unrealized gains or losses to be reclassified over the next twelve months, net of tax 0      
Gains (losses) on firm commitments that no longer qualify as net investment hedges 0 0 $ 0  
Net cash collateral received $ 48,000,000 44,000,000    
4.125 percent ten-year 2011 senior notes | Senior Notes        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Face value of debt   $ 500,000,000    
Stated interest rate 4.125% 4.125%   4.125%
3.125 percent ten-year 2012 senior notes | Senior Notes        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Face value of debt   $ 675,000,000    
Stated interest rate 3.125% 3.125%   3.125%
Currency exchange rate contracts        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Gross notional amount $ 11,900,000,000 $ 11,100,000,000    
Currency exchange rate contracts | Derivatives not designated as hedging instruments        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Gross notional amount 4,900,000,000 4,300,000,000    
Currency exchange rate contracts | Derivatives designated as hedging instruments | Cash flow hedges        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Gross notional amount $ 7,000,000,000.0 6,800,000,000    
Maximum remaining maturity of foreign currency derivatives 3 years      
Currency exchange rate contracts | Derivatives designated as hedging instruments | Net investment hedges        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Gross notional amount $ 13,000,000,000.0     € 12.0
Total return swaps | Derivatives not designated as hedging instruments        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Gross notional amount $ 181,000,000 191,000,000    
Interest rate swaps | Derivatives designated as hedging instruments | Fair value hedges        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Gross notional amount   1,200,000,000    
Number of interest rate swaps outstanding | derivative 0     0
Market value of outstanding interest rate swap agreements - net unrealized gain   9,000,000    
Interest rate swaps | Derivatives designated as hedging instruments | Fair value hedges | 4.125 percent ten-year 2011 senior notes | Senior Notes        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Face value of debt   $ 500,000,000    
Stated interest rate   4.125%    
Interest rate swaps | Derivatives designated as hedging instruments | Fair value hedges | 3.125 percent ten-year 2012 senior notes | Senior Notes        
Derivative Instruments and Hedging Activities Disclosures [Line Items]        
Face value of debt   $ 675,000,000    
Stated interest rate   3.125%