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Debt (Long-Term Debt) (Details) - USD ($)
$ in Millions
Jan. 29, 2017
Jan. 31, 2016
Debt Instrument [Line Items]    
Senior Notes $ 22,000 $ 20,100
Capital Lease Obligations; payable in varying installments through January 31, 2055 878 763
Other 0 1
Total debt 22,891 20,866
Less current installments 542 77
Long-Term Debt, excluding current installments 22,349 20,789
5.40% Senior Notes Due March 1, 2016 [Member]    
Debt Instrument [Line Items]    
Senior Notes 0 3,010
Floating Rate Senior Notes Due September 15, 2017 [Member]    
Debt Instrument [Line Items]    
Senior Notes 499 499
2.25% Senior Notes Due September 10, 2018 [Member]    
Debt Instrument [Line Items]    
Senior Notes 1,151 1,156
2.00% Senior Notes Due June 15, 2019 [Member]    
Debt Instrument [Line Items]    
Senior Notes 996 994
3.95% Senior Notes Due September 15, 2020 [Member]    
Debt Instrument [Line Items]    
Senior Notes 509 524
4.40% Senior Notes Due April 1, 2021 [Member]    
Debt Instrument [Line Items]    
Senior Notes 997 996
2.00% Senior Notes Due April 1, 2021 [Member]    
Debt Instrument [Line Items]    
Senior Notes 1,341 0
2.625% Senior Notes Due June 1, 2022 [Member]    
Debt Instrument [Line Items]    
Senior Notes 1,241 1,240
2.70% Senior Notes Due April 1, 2023 [Member]    
Debt Instrument [Line Items]    
Senior Notes 996 995
3.75% Senior Notes Due February 15, 2024 [Member]    
Debt Instrument [Line Items]    
Senior Notes 1,092 1,091
3.35% Senior Notes Due September 15, 2025 [Member]    
Debt Instrument [Line Items]    
Senior Notes 994 993
3.00% Senior Notes Due April 1, 2026 [Member]    
Debt Instrument [Line Items]    
Senior Notes 1,286 0
2.125% Senior Notes Due September 15, 2026 [Member]    
Debt Instrument [Line Items]    
Senior Notes 984 0
5.875% Senior Notes Due December 16, 2036 [Member]    
Debt Instrument [Line Items]    
Senior Notes 2,947 2,946
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 988 987
4.875% Senior Notes Due February 15, 2044 [Member]    
Debt Instrument [Line Items]    
Senior Notes 978 977
4.40% Senior Notes Due March 15, 2045 [Member]    
Debt Instrument [Line Items]    
Senior Notes 976 976
4.25% Senior Notes Due April 1, 2046 [Member]    
Debt Instrument [Line Items]    
Senior Notes 1,584 1,235
3.5% Senior Notes Due September 15, 2056 [Member]    
Debt Instrument [Line Items]    
Senior Notes $ 971 $ 0