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Derivatives and Currency Exchange Risk Management - Narrative (Details)
€ in Billions
3 Months Ended 6 Months Ended
Oct. 25, 2019
USD ($)
derivative
Oct. 26, 2018
USD ($)
Oct. 25, 2019
USD ($)
derivative
Oct. 26, 2018
USD ($)
Oct. 25, 2019
EUR (€)
derivative
Apr. 26, 2019
USD ($)
Derivative Instruments and Hedging Activities Disclosures [Line Items]            
After-tax net unrealized gains (losses) associated with cash flow hedging instruments recorded in AOCI $ 192,000,000   $ 192,000,000     $ 194,000,000
Cash flow hedge unrealized gains to be reclassified over the next 12 months     165,000,000      
Debt, face amount 25,300,000,000   25,300,000,000     25,000,000,000.0
Gains (losses) on firm commitments that no longer qualify as fair value hedges 0 $ 0 0 $ 0    
After-tax net unrealized gains (losses) associated with net investment hedging instruments recorded in AOCI     (17,000,000) (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 $ 0    
4.125 percent ten-year 2011 senior notes | Senior notes            
Derivative Instruments and Hedging Activities Disclosures [Line Items]            
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]            
Stated interest rate 3.125%   3.125%   3.125%  
Currency exchange rate contracts            
Derivative Instruments and Hedging Activities Disclosures [Line Items]            
Gross notional amount $ 10,900,000,000   $ 10,900,000,000     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 4,300,000,000   4,300,000,000     4,300,000,000
Currency exchange rate contracts | Derivatives designated as hedging instruments | Cash flow hedging            
Derivative Instruments and Hedging Activities Disclosures [Line Items]            
Gross notional amount 6,500,000,000   $ 6,500,000,000     6,800,000,000
Maximum remaining maturity of foreign currency derivatives     2 years      
Currency exchange rate contracts | Derivatives designated as hedging instruments | Net investment hedging            
Derivative Instruments and Hedging Activities Disclosures [Line Items]            
Gross notional amount 13,300,000,000   $ 13,300,000,000   € 12.0  
Total return swaps | Derivatives not designated as hedging instruments            
Derivative Instruments and Hedging Activities Disclosures [Line Items]            
Gross notional amount $ 191,000,000   $ 191,000,000     191,000,000
Interest rate swaps | Derivatives designated as hedging instruments | Fair value hedging            
Derivative Instruments and Hedging Activities Disclosures [Line Items]            
Gross notional amount           1,200,000,000
Number of interest rate swaps outstanding | derivative 0   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 hedging | 4.125 percent ten-year 2011 senior notes | Senior notes            
Derivative Instruments and Hedging Activities Disclosures [Line Items]            
Debt, face amount           $ 500,000,000
Stated interest rate           4.125%
Interest rate swaps | Derivatives designated as hedging instruments | Fair value hedging | 3.125 percent ten-year 2012 senior notes | Senior notes            
Derivative Instruments and Hedging Activities Disclosures [Line Items]            
Debt, face amount           $ 675,000,000
Stated interest rate           3.125%