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Debt and Derivative Instruments (Long-term Debt) (Details) - USD ($)
Jan. 31, 2021
Feb. 02, 2020
Debt Instrument [Line Items]    
Debt instrument, face amount $ 34,750,000,000  
Senior notes 34,472,000,000 $ 29,344,000,000
Finance lease obligations; payable in varying installments through January 31, 2055 2,766,000,000 1,165,000,000
Total long-term debt 37,238,000,000 30,509,000,000
Less current installments 1,416,000,000 1,839,000,000
Long-term debt, excluding current installments 35,822,000,000 28,670,000,000
Floating rate senior notes due June 2020    
Debt Instrument [Line Items]    
Debt instrument, face amount 0  
Senior notes $ 0 500,000,000
1.80% Senior notes due June 2020    
Debt Instrument [Line Items]    
Debt instrument, interest rate, stated percentage 1.80%  
Debt instrument, face amount $ 0  
Senior notes $ 0 750,000,000
3.95% Senior notes due September 2020    
Debt Instrument [Line Items]    
Debt instrument, interest rate, stated percentage 3.95%  
Debt instrument, face amount $ 0  
Senior notes $ 0 506,000,000
4.40% Senior notes due April 2021    
Debt Instrument [Line Items]    
Debt instrument, interest rate, stated percentage 4.40%  
Debt instrument, face amount $ 0  
Senior notes $ 0 999,000,000
2.00% Senior notes due April 2021    
Debt Instrument [Line Items]    
Debt instrument, interest rate, stated percentage 2.00%  
Debt instrument, face amount $ 1,350,000,000  
Senior notes 1,350,000,000 1,348,000,000
Floating rate senior notes due March 2022    
Debt Instrument [Line Items]    
Debt instrument, face amount 300,000,000  
Senior notes $ 300,000,000 299,000,000
3.25% Senior notes due March 2022    
Debt Instrument [Line Items]    
Debt instrument, interest rate, stated percentage 3.25%  
Debt instrument, face amount $ 700,000,000  
Senior notes $ 699,000,000 698,000,000
2.625% Senior notes due June 2022    
Debt Instrument [Line Items]    
Debt instrument, interest rate, stated percentage 2.625%  
Debt instrument, face amount $ 1,250,000,000  
Senior notes $ 1,248,000,000 1,246,000,000
2.70% Senior notes due April 2023    
Debt Instrument [Line Items]    
Debt instrument, interest rate, stated percentage 2.70%  
Debt instrument, face amount $ 1,000,000,000  
Senior notes $ 998,000,000 998,000,000
3.75% Senior notes due February 2024    
Debt Instrument [Line Items]    
Debt instrument, interest rate, stated percentage 3.75%  
Debt instrument, face amount $ 1,100,000,000  
Senior notes $ 1,096,000,000 1,095,000,000
3.35% Senior notes due September 2025    
Debt Instrument [Line Items]    
Debt instrument, interest rate, stated percentage 3.35%  
Debt instrument, face amount $ 1,000,000,000  
Senior notes $ 997,000,000 996,000,000
3.00% Senior notes due April 2026    
Debt Instrument [Line Items]    
Debt instrument, interest rate, stated percentage 3.00%  
Debt instrument, face amount $ 1,300,000,000  
Senior notes $ 1,291,000,000 1,290,000,000
2.125% Senior notes due September 2026    
Debt Instrument [Line Items]    
Debt instrument, interest rate, stated percentage 2.125%  
Debt instrument, face amount $ 1,000,000,000  
Senior notes $ 990,000,000 989,000,000
2.50% Senior notes due April 2027    
Debt Instrument [Line Items]    
Debt instrument, interest rate, stated percentage 2.50%  
Debt instrument, face amount $ 750,000,000  
Senior notes $ 743,000,000 0
2.80% Senior notes due September 2027    
Debt Instrument [Line Items]    
Debt instrument, interest rate, stated percentage 2.80%  
Debt instrument, face amount $ 1,000,000,000  
Senior notes $ 1,017,000,000 1,007,000,000
0.90% Senior notes due March 2028    
Debt Instrument [Line Items]    
Debt instrument, interest rate, stated percentage 0.90%  
Debt instrument, face amount $ 500,000,000  
Senior notes $ 494,000,000 0
3.90% Senior notes due December 2028    
Debt Instrument [Line Items]    
Debt instrument, interest rate, stated percentage 3.90%  
Debt instrument, face amount $ 1,000,000,000  
Senior notes $ 1,075,000,000 1,059,000,000
2.95% Senior notes due June 2029    
Debt Instrument [Line Items]    
Debt instrument, interest rate, stated percentage 2.95%  
Debt instrument, face amount $ 1,750,000,000  
Senior notes $ 1,828,000,000 1,797,000,000
2.70% Senior notes due April 2030    
Debt Instrument [Line Items]    
Debt instrument, interest rate, stated percentage 2.70%  
Debt instrument, face amount $ 1,500,000,000  
Senior notes $ 1,464,000,000 0
1.375% Senior notes due March 2031    
Debt Instrument [Line Items]    
Debt instrument, interest rate, stated percentage 1.375%  
Debt instrument, face amount $ 1,250,000,000  
Senior notes $ 1,229,000,000 0
5.875% Senior notes due December 2036    
Debt Instrument [Line Items]    
Debt instrument, interest rate, stated percentage 5.875%  
Debt instrument, face amount $ 3,000,000,000  
Senior notes $ 2,935,000,000 2,953,000,000
3.30% Senior notes due April 2040    
Debt Instrument [Line Items]    
Debt instrument, interest rate, stated percentage 3.30%  
Debt instrument, face amount $ 1,250,000,000  
Senior notes $ 1,207,000,000 0
5.40% Senior notes due September 2040    
Debt Instrument [Line Items]    
Debt instrument, interest rate, stated percentage 5.40%  
Debt instrument, face amount $ 500,000,000  
Senior notes $ 496,000,000 495,000,000
5.95% Senior notes due April 2041    
Debt Instrument [Line Items]    
Debt instrument, interest rate, stated percentage 5.95%  
Debt instrument, face amount $ 1,000,000,000  
Senior notes $ 990,000,000 989,000,000
4.20% Senior notes due April 2043    
Debt Instrument [Line Items]    
Debt instrument, interest rate, stated percentage 4.20%  
Debt instrument, face amount $ 1,000,000,000  
Senior notes $ 989,000,000 989,000,000
4.875% Senior notes due February 2044    
Debt Instrument [Line Items]    
Debt instrument, interest rate, stated percentage 4.875%  
Debt instrument, face amount $ 1,000,000,000  
Senior notes $ 980,000,000 979,000,000
4.40% Senior notes due March 2045    
Debt Instrument [Line Items]    
Debt instrument, interest rate, stated percentage 4.40%  
Debt instrument, face amount $ 1,000,000,000  
Senior notes $ 979,000,000 978,000,000
4.25% Senior notes due April 2046    
Debt Instrument [Line Items]    
Debt instrument, interest rate, stated percentage 4.25%  
Debt instrument, face amount $ 1,600,000,000  
Senior notes $ 1,585,000,000 1,585,000,000
3.90% Senior notes due June 2047    
Debt Instrument [Line Items]    
Debt instrument, interest rate, stated percentage 3.90%  
Debt instrument, face amount $ 1,150,000,000  
Senior notes $ 1,144,000,000 1,144,000,000
4.50% Senior notes due December 2048    
Debt Instrument [Line Items]    
Debt instrument, interest rate, stated percentage 4.50%  
Debt instrument, face amount $ 1,500,000,000  
Senior notes $ 1,463,000,000 1,462,000,000
3.125% Senior notes due December 2049    
Debt Instrument [Line Items]    
Debt instrument, interest rate, stated percentage 3.125%  
Debt instrument, face amount $ 1,250,000,000  
Senior notes $ 1,222,000,000 1,221,000,000
3.35% Senior notes due April 2050    
Debt Instrument [Line Items]    
Debt instrument, interest rate, stated percentage 3.35%  
Debt instrument, face amount $ 1,500,000,000  
Senior notes $ 1,470,000,000 0
2.375% Senior notes due March 2051    
Debt Instrument [Line Items]    
Debt instrument, interest rate, stated percentage 2.375%  
Debt instrument, face amount $ 1,250,000,000  
Senior notes $ 1,220,000,000 0
3.50% Senior notes due September 2056    
Debt Instrument [Line Items]    
Debt instrument, interest rate, stated percentage 3.50%  
Debt instrument, face amount $ 1,000,000,000  
Senior notes $ 973,000,000 $ 972,000,000