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Debt (Long-term Debt) (Details) - USD ($)
$ in Millions
Jan. 28, 2018
Jan. 29, 2017
Debt Instrument [Line Items]    
Senior Notes $ 24,485 $ 22,013
Capital lease obligations; payable in varying installments through January 31, 2055 984 878
Total long-term debt 25,469 22,891
Less current installments 1,202 542
Long-term debt, excluding current installments 24,267 22,349
Floating Rate Senior Notes due September 15, 2017 [Member]    
Debt Instrument [Line Items]    
Senior Notes 0 499
2.25% Senior Notes due September 10, 2018 [Member]    
Debt Instrument [Line Items]    
Senior Notes 1,137 1,151
2.00% Senior Notes due June 15, 2019 [Member]    
Debt Instrument [Line Items]    
Senior Notes 998 996
Floating Rate Senior Notes due June 5, 2020 [Member]    
Debt Instrument [Line Items]    
Senior Notes 499 0
1.80% Senior Notes due June 5, 2020 [Member]    
Debt Instrument [Line Items]    
Senior Notes 748 0
3.95% Senior Notes due September 15, 2020 [Member]    
Debt Instrument [Line Items]    
Senior Notes 501 509
4.40% Senior Notes due April 1, 2021 [Member]    
Debt Instrument [Line Items]    
Senior Notes 998 997
2.00% Senior Notes due April 1, 2021 [Member]    
Debt Instrument [Line Items]    
Senior Notes 1,343 1,341
2.625% Senior Notes due June 1, 2022 [Member]    
Debt Instrument [Line Items]    
Senior Notes 1,243 1,241
2.70% Senior Notes due April 1, 2023 [Member]    
Debt Instrument [Line Items]    
Senior Notes 996 996
3.75% Senior Notes due February 15, 2024 [Member]    
Debt Instrument [Line Items]    
Senior Notes 1,093 1,092
3.35% Senior Notes due September 15, 2025 [Member]    
Debt Instrument [Line Items]    
Senior Notes 995 994
3.00% Senior Notes due April 1, 2026 [Member]    
Debt Instrument [Line Items]    
Senior Notes 1,287 1,286
2.125% Senior Notes due September 15, 2026 [Member]    
Debt Instrument [Line Items]    
Senior Notes 986 984
2.80% Senior Notes due September 14, 2027 [Member]    
Debt Instrument [Line Items]    
Senior Notes 993 0
5.875% Senior Notes due December 16, 2036 [Member]    
Debt Instrument [Line Items]    
Senior Notes 2,949 2,947
5.40% Senior Notes due September 15, 2040 [Member]    
Debt Instrument [Line Items]    
Senior Notes 495 495
5.95% Senior Notes due April 1, 2041 [Member]    
Debt Instrument [Line Items]    
Senior Notes 988 988
4.20% Senior Notes due April 1, 2043 [Member]    
Debt Instrument [Line Items]    
Senior Notes 988 988
4.875% Senior Notes due February 15, 2044 [Member]    
Debt Instrument [Line Items]    
Senior Notes 978 978
4.40% Senior Notes due March 15, 2045 [Member]    
Debt Instrument [Line Items]    
Senior Notes 977 976
4.25% Senior Notes due April 1, 2046 [Member]    
Debt Instrument [Line Items]    
Senior Notes 1,584 1,584
3.90% Senior Notes due June 15, 2047 [Member]    
Debt Instrument [Line Items]    
Senior Notes 738 0
3.5% Senior Notes due September 15, 2056 [Member]    
Debt Instrument [Line Items]    
Senior Notes $ 971 $ 971