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Derivatives and Currency Exchange Risk Management - Narrative (Details)
€ in Billions
3 Months Ended 9 Months Ended 12 Months Ended
Jan. 24, 2020
USD ($)
Jan. 25, 2019
USD ($)
Jan. 24, 2020
USD ($)
Jan. 25, 2019
USD ($)
Apr. 26, 2019
USD ($)
Jan. 24, 2020
EUR (€)
derivative
Jan. 24, 2020
USD ($)
derivative
Derivative Instruments and Hedging Activities Disclosures [Line Items]              
After-tax net unrealized gains (losses) associated with cash flow hedging instruments recorded in AOCI         $ 194,000,000   $ 157,000,000
Cash flow hedge unrealized gains to be reclassified over the next 12 months     $ 145,000,000        
Debt, face amount         25,000,000,000.0   $ 25,200,000,000
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     18,000,000   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%
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%
Currency exchange rate contracts              
Derivative Instruments and Hedging Activities Disclosures [Line Items]              
Gross notional amount         11,100,000,000   $ 12,100,000,000
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   5,200,000,000
Currency exchange rate contracts | Derivatives designated as hedging instruments | Cash flow hedging              
Derivative Instruments and Hedging Activities Disclosures [Line Items]              
Gross notional amount         6,800,000,000   6,900,000,000
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           € 12.0 13,300,000,000
Total return swaps | Derivatives not designated as hedging instruments              
Derivative Instruments and Hedging Activities Disclosures [Line Items]              
Gross notional amount         191,000,000   $ 215,000,000
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
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%