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Derivatives and Currency Exchange Risk Management - Narrative (Details)
3 Months Ended 6 Months Ended 12 Months Ended
Oct. 30, 2020
USD ($)
Oct. 25, 2019
USD ($)
Oct. 30, 2020
USD ($)
Oct. 25, 2019
USD ($)
Apr. 24, 2020
USD ($)
Oct. 30, 2020
EUR (€)
Oct. 30, 2020
JPY (¥)
Derivative Instruments and Hedging Activities Disclosures [Line Items]              
After-tax net unrealized gains (losses) associated with cash flow hedging instruments recorded in AOCI $ (129,000,000)   $ (129,000,000)   $ 266,000,000    
Cash flow hedge unrealized losses to be reclassified over the next 12 months     34,000,000        
After-tax net unrealized gains (losses) associated with net investment hedging instruments recorded in AOCI     (1,000,000,000.0)   236,000,000    
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      
Currency exchange rate contracts              
Derivative Instruments and Hedging Activities Disclosures [Line Items]              
Gross notional amount 18,500,000,000   18,500,000,000   11,900,000,000    
Currency exchange rate contracts | Derivatives not designated as hedging instruments              
Derivative Instruments and Hedging Activities Disclosures [Line Items]              
Gross notional amount 10,700,000,000   10,700,000,000   4,900,000,000    
Currency exchange rate contracts | Derivatives designated as hedging instruments | Cash flow hedging              
Derivative Instruments and Hedging Activities Disclosures [Line Items]              
Gross notional amount 7,800,000,000   $ 7,800,000,000   7,000,000,000.0    
Maximum remaining maturity of foreign currency derivatives     3 years        
Currency exchange rate contracts | Derivatives designated as hedging instruments | Net investment hedging              
Derivative Instruments and Hedging Activities Disclosures [Line Items]              
Gross notional amount           € 16,000,000,000.0 ¥ 300,000,000,000
Currency exchange rate contracts | Derivatives designated as hedging instruments | Net investment hedging | Euro-denominated Debt              
Derivative Instruments and Hedging Activities Disclosures [Line Items]              
Gross notional amount 18,900,000,000   $ 18,900,000,000        
Currency exchange rate contracts | Derivatives designated as hedging instruments | Net investment hedging | Japanese Yen-denominated Debt              
Derivative Instruments and Hedging Activities Disclosures [Line Items]              
Gross notional amount 2,900,000,000   2,900,000,000        
Total return swaps | Derivatives not designated as hedging instruments              
Derivative Instruments and Hedging Activities Disclosures [Line Items]              
Gross notional amount $ 197,000,000   $ 197,000,000   $ 181,000,000