Debt (Long-term Debt) (Details) - USD ($) $ in Millions	12 Months Ended
	Feb. 03, 2019	Jan. 28, 2018
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 27,100
Senior Notes	26,814	$ 24,485
Capital lease obligations; payable in varying installments through January 31, 2055	1,049	984
Total long-term debt	27,863	25,469
Less current installments	1,056	1,202
Long-term debt, excluding current installments	$ 26,807	24,267
2.25% Senior Notes due September 10, 2018 [Member]
Debt Instrument [Line Items]
Frequency of Interest Payment	Semi-annually on March 10 and September 10
Debt Instrument, Face Amount	$ 0
Senior Notes	$ 0	1,150
Debt Instrument, Interest Rate, Stated Percentage	2.25%
Debt Instrument, Maturity Date	Sep. 10, 2018
2.00% Senior Notes due June 15, 2019 [Member]
Debt Instrument [Line Items]
Frequency of Interest Payment	Semi-annually on June 15 and December 15
Debt Instrument, Face Amount	$ 1,000
Senior Notes	$ 999	998
Debt Instrument, Interest Rate, Stated Percentage	2.00%
Debt Instrument, Maturity Date	Jun. 15, 2019
Floating Rate Senior Notes due June 5, 2020 [Member]
Debt Instrument [Line Items]
Frequency of Interest Payment	Quarterly on March 5, June 5, September 5, and December 5
Debt Instrument, Face Amount	$ 500
Senior Notes	$ 499	499
Debt Instrument, Maturity Date	Jun. 05, 2020
1.80% Senior Notes due June 5, 2020 [Member]
Debt Instrument [Line Items]
Frequency of Interest Payment	Semi-annually on June 5 and December 5
Debt Instrument, Face Amount	$ 750
Senior Notes	$ 749	748
Debt Instrument, Interest Rate, Stated Percentage	1.80%
Debt Instrument, Maturity Date	Jun. 05, 2020
Unamortized discount	$ 1
3.95% Senior Notes due September 15, 2020 [Member]
Debt Instrument [Line Items]
Frequency of Interest Payment	Semi-annually on March 15 and September 15
Debt Instrument, Face Amount	$ 500
Senior Notes	$ 499	501
Debt Instrument, Interest Rate, Stated Percentage	3.95%
Debt Instrument, Maturity Date	Sep. 15, 2020
4.40% Senior Notes due April 1, 2021 [Member]
Debt Instrument [Line Items]
Frequency of Interest Payment	Semi-annually on April 1 and October 1
Debt Instrument, Face Amount	$ 1,000
Senior Notes	$ 999	998
Debt Instrument, Interest Rate, Stated Percentage	4.40%
Debt Instrument, Maturity Date	Apr. 01, 2021
2.00% Senior Notes due April 1, 2021 [Member]
Debt Instrument [Line Items]
Frequency of Interest Payment	Semi-annually on April 1 and October 1
Debt Instrument, Face Amount	$ 1,350
Senior Notes	$ 1,345	1,343
Debt Instrument, Interest Rate, Stated Percentage	2.00%
Debt Instrument, Maturity Date	Apr. 01, 2021
3.25% Senior Notes Due March 1, 2022 [Member]
Debt Instrument [Line Items]
Frequency of Interest Payment	Semi-annually on March 1 and September 1
Debt Instrument, Face Amount	$ 700
Senior Notes	$ 696	0
Debt Instrument, Interest Rate, Stated Percentage	3.25%
Debt Instrument, Maturity Date	Mar. 01, 2022
Unamortized discount	$ 2
Floating Rate Senior Notes Due March 1, 2022 [Member]
Debt Instrument [Line Items]
Frequency of Interest Payment	Quarterly on March 1, June 1, September 1, and December 1
Debt Instrument, Face Amount	$ 300
Senior Notes	$ 299	0
Debt Instrument, Maturity Date	Mar. 01, 2022
2.625% Senior Notes due June 1, 2022 [Member]
Debt Instrument [Line Items]
Frequency of Interest Payment	Semi-annually on June 1 and December 1
Debt Instrument, Face Amount	$ 1,250
Senior Notes	$ 1,245	1,243
Debt Instrument, Interest Rate, Stated Percentage	2.625%
Debt Instrument, Maturity Date	Jun. 01, 2022
2.70% Senior Notes due April 1, 2023 [Member]
Debt Instrument [Line Items]
Frequency of Interest Payment	Semi-annually on April 1 and October 1
Debt Instrument, Face Amount	$ 1,000
Senior Notes	$ 997	996
Debt Instrument, Interest Rate, Stated Percentage	2.70%
Debt Instrument, Maturity Date	Apr. 01, 2023
3.75% Senior Notes due February 15, 2024 [Member]
Debt Instrument [Line Items]
Frequency of Interest Payment	Semi-annually on February 15 and August 15
Debt Instrument, Face Amount	$ 1,100
Senior Notes	$ 1,094	1,093
Debt Instrument, Interest Rate, Stated Percentage	3.75%
Debt Instrument, Maturity Date	Feb. 15, 2024
3.35% Senior Notes due September 15, 2025 [Member]
Debt Instrument [Line Items]
Frequency of Interest Payment	Semi-annually on March 15 and September 15
Debt Instrument, Face Amount	$ 1,000
Senior Notes	$ 995	995
Debt Instrument, Interest Rate, Stated Percentage	3.35%
Debt Instrument, Maturity Date	Sep. 15, 2025
3.00% Senior Notes due April 1, 2026 [Member]
Debt Instrument [Line Items]
Frequency of Interest Payment	Semi-annually on April 1 and October 1
Debt Instrument, Face Amount	$ 1,300
Senior Notes	$ 1,288	1,287
Debt Instrument, Interest Rate, Stated Percentage	3.00%
Debt Instrument, Maturity Date	Apr. 01, 2026
2.125% Senior Notes due September 15, 2026 [Member]
Debt Instrument [Line Items]
Frequency of Interest Payment	Semi-annually on March 15 and September 15
Debt Instrument, Face Amount	$ 1,000
Senior Notes	$ 987	986
Debt Instrument, Interest Rate, Stated Percentage	2.125%
Debt Instrument, Maturity Date	Sep. 15, 2026
2.80% Senior Notes due September 14, 2027 [Member]
Debt Instrument [Line Items]
Frequency of Interest Payment	Semi-annually on March 14 and September 14
Debt Instrument, Face Amount	$ 1,000
Senior Notes	$ 981	980
Debt Instrument, Interest Rate, Stated Percentage	2.80%
Debt Instrument, Maturity Date	Sep. 14, 2027
Unamortized discount	$ 3
Debt Issuance Costs, Gross	$ 6
3.90% Senior Notes Due December 6, 2028 [Member]
Debt Instrument [Line Items]
Frequency of Interest Payment	Semi-annually on June 6 and December 6
Debt Instrument, Face Amount	$ 1,000
Senior Notes	$ 1,005	0
Debt Instrument, Interest Rate, Stated Percentage	3.90%
Debt Instrument, Maturity Date	Dec. 06, 2028
Unamortized discount	$ 7
5.875% Senior Notes due December 16, 2036 [Member]
Debt Instrument [Line Items]
Frequency of Interest Payment	Semi-annually on June 16 and December 16
Debt Instrument, Face Amount	$ 3,000
Senior Notes	$ 2,951	2,949
Debt Instrument, Interest Rate, Stated Percentage	5.875%
Debt Instrument, Maturity Date	Dec. 16, 2036
5.40% Senior Notes due September 15, 2040 [Member]
Debt Instrument [Line Items]
Frequency of Interest Payment	Semi-annually on March 15 and September 15
Debt Instrument, Face Amount	$ 500
Senior Notes	$ 495	495
Debt Instrument, Interest Rate, Stated Percentage	5.40%
Debt Instrument, Maturity Date	Sep. 15, 2040
5.95% Senior Notes due April 1, 2041 [Member]
Debt Instrument [Line Items]
Frequency of Interest Payment	Semi-annually on April 1 and October 1
Debt Instrument, Face Amount	$ 1,000
Senior Notes	$ 989	988
Debt Instrument, Interest Rate, Stated Percentage	5.95%
Debt Instrument, Maturity Date	Apr. 01, 2041
4.20% Senior Notes due April 1, 2043 [Member]
Debt Instrument [Line Items]
Frequency of Interest Payment	Semi-annually on April 1 and October 1
Debt Instrument, Face Amount	$ 1,000
Senior Notes	$ 989	988
Debt Instrument, Interest Rate, Stated Percentage	4.20%
Debt Instrument, Maturity Date	Apr. 01, 2043
4.875% Senior Notes due February 15, 2044 [Member]
Debt Instrument [Line Items]
Frequency of Interest Payment	Semi-annually on February 15 and August 15
Debt Instrument, Face Amount	$ 1,000
Senior Notes	$ 979	978
Debt Instrument, Interest Rate, Stated Percentage	4.875%
Debt Instrument, Maturity Date	Feb. 15, 2044
4.40% Senior Notes due March 15, 2045 [Member]
Debt Instrument [Line Items]
Frequency of Interest Payment	Semi-annually on March 15 and September 15
Debt Instrument, Face Amount	$ 1,000
Senior Notes	$ 977	977
Debt Instrument, Interest Rate, Stated Percentage	4.40%
Debt Instrument, Maturity Date	Mar. 15, 2045
4.25% Senior Notes due April 1, 2046 [Member]
Debt Instrument [Line Items]
Frequency of Interest Payment	Semi-annually on April 1 and October 1
Debt Instrument, Face Amount	$ 1,600
Senior Notes	$ 1,585	1,584
Debt Instrument, Interest Rate, Stated Percentage	4.25%
Debt Instrument, Maturity Date	Apr. 01, 2046
3.90% Senior Notes due June 15, 2047 [Member]
Debt Instrument [Line Items]
Frequency of Interest Payment	Semi-annually June 15 and September 15
Debt Instrument, Face Amount	$ 750
Senior Notes	$ 738	738
Debt Instrument, Interest Rate, Stated Percentage	3.90%
Debt Instrument, Maturity Date	Jun. 15, 2047
Unamortized discount	$ 5
4.50% Senior Notes Due December 6, 2048 [Member]
Debt Instrument [Line Items]
Frequency of Interest Payment	Semi-annually on June 6 and December 6
Debt Instrument, Face Amount	$ 1,500
Senior Notes	$ 1,462	0
Debt Instrument, Interest Rate, Stated Percentage	4.50%
Debt Instrument, Maturity Date	Dec. 06, 2048
Unamortized discount	$ 25
December 2018 Issuance [Member]
Debt Instrument [Line Items]
Debt Issuance Costs, Gross	$ 22
3.5% Senior Notes due September 15, 2056 [Member]
Debt Instrument [Line Items]
Frequency of Interest Payment	Semi-annually on March 15 and September 15
Debt Instrument, Face Amount	$ 1,000
Senior Notes	$ 972	$ 971
Debt Instrument, Interest Rate, Stated Percentage	3.50%
Debt Instrument, Maturity Date	Sep. 15, 2056
June 2017 Issuance [Member]
Debt Instrument [Line Items]
Debt Issuance Costs, Gross	$ 12
London Interbank Offered Rate (LIBOR) [Member] | Floating Rate Senior Notes due June 5, 2020 [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	15.00%
London Interbank Offered Rate (LIBOR) [Member] | Floating Rate Senior Notes Due March 1, 2022 [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	31.00%