Debt and Derivative Instruments (Long-term Debt) (Details) - USD ($) | 12 Months Ended | | | | | |
Feb. 02, 2020 | Dec. 15, 2019 | Aug. 04, 2019 | Jun. 15, 2019 | Feb. 03, 2019 | Jun. 30, 2017 |
Debt Instrument [Line Items] | | | | | | |
Debt instrument, face amount | $ 29,500,000,000 | | | | | |
Senior notes | 29,344,000,000 | | | | $ 26,814,000,000 | |
Debt instrument, interest rate, stated percentage | | | | 2.00% | | |
Finance lease obligations; payable in varying installments through January 31, 2055 | 1,165,000,000 | | | | | |
Capital lease obligations; payable in varying installments through January 31, 2055 | | | | | 1,049,000,000 | |
Total long-term debt | 30,509,000,000 | | | | 27,863,000,000 | |
Less current installments | 1,839,000,000 | | | | 1,056,000,000 | |
Long-term debt, excluding current installments | $ 28,670,000,000 | | | | 26,807,000,000 | |
2.00% Senior notes due June 2019 | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Frequency of interest payment | Semi-annually on June 15 and December 15 | | | | | |
Debt instrument, face amount | $ 0 | | | | | |
Senior notes | $ 0 | | | | 999,000,000 | |
Debt instrument, interest rate, stated percentage | 2.00% | | | | | |
Debt instrument, maturity date | Jun. 15, 2019 | | | | | |
Floating rate senior notes due June 2020 | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Frequency of interest payment | Quarterly on March 5, June 5, September 5, and December 5 | | | | | |
Debt instrument, face amount | $ 500,000,000 | | | | | |
Senior notes | $ 500,000,000 | | | | 499,000,000 | |
Debt instrument, maturity date | Jun. 5, 2020 | | | | | |
1.80% Senior notes due June 2020 | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Frequency of interest payment | Semi-annually on June 5 and December 5 | | | | | |
Debt instrument, face amount | $ 750,000,000 | | | | | |
Senior notes | $ 750,000,000 | | | | 749,000,000 | |
Debt instrument, interest rate, stated percentage | 1.80% | | | | | |
Debt instrument, maturity date | Jun. 5, 2020 | | | | | |
3.95% Senior notes due September 2020 | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Frequency of interest payment | Semi-annually on March 15 and September 15 | | | | | |
Debt instrument, face amount | $ 500,000,000 | | | | | |
Senior notes | $ 506,000,000 | | | | 499,000,000 | |
Debt instrument, interest rate, stated percentage | 3.95% | | | | | |
Debt instrument, maturity date | Sep. 15, 2020 | | | | | |
4.40% Senior notes due April 2021 | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Frequency of interest payment | Semi-annually on April 1 and October 1 | | | | | |
Debt instrument, face amount | $ 1,000,000,000 | | | | | |
Senior notes | $ 999,000,000 | | | | 999,000,000 | |
Debt instrument, interest rate, stated percentage | 4.40% | | | | | |
Debt instrument, maturity date | Apr. 1, 2021 | | | | | |
2.00% Senior notes due April 2021 | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Frequency of interest payment | Semi-annually on April 1 and October 1 | | | | | |
Debt instrument, face amount | $ 1,350,000,000 | | | | | |
Senior notes | $ 1,348,000,000 | | | | 1,345,000,000 | |
Debt instrument, interest rate, stated percentage | 2.00% | | | | | |
Debt instrument, maturity date | Apr. 1, 2021 | | | | | |
Floating rate senior notes due March 2022 | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Frequency of interest payment | Quarterly on March 1, June 1, September 1, and December 1 | | | | | |
Debt instrument, face amount | $ 300,000,000 | | | | | |
Senior notes | $ 299,000,000 | | | | 299,000,000 | |
Debt instrument, maturity date | Mar. 1, 2022 | | | | | |
3.25% Senior notes due March 2022 | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Frequency of interest payment | Semi-annually on March 1 and September 1 | | | | | |
Debt instrument, face amount | $ 700,000,000 | | | | | |
Senior notes | $ 698,000,000 | | | | 696,000,000 | |
Debt instrument, interest rate, stated percentage | 3.25% | | | | | |
Debt instrument, maturity date | Mar. 1, 2022 | | | | | |
Unamortized discount | $ 2,000,000 | | | | | |
2.625% Senior notes due June 2022 | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Frequency of interest payment | Semi-annually on June 1 and December 1 | | | | | |
Debt instrument, face amount | $ 1,250,000,000 | | | | | |
Senior notes | $ 1,246,000,000 | | | | 1,245,000,000 | |
Debt instrument, interest rate, stated percentage | 2.625% | | | | | |
Debt instrument, maturity date | Jun. 1, 2022 | | | | | |
2.70% Senior notes due April 2023 | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Frequency of interest payment | Semi-annually on April 1 and October 1 | | | | | |
Debt instrument, face amount | $ 1,000,000,000 | | | | | |
Senior notes | $ 998,000,000 | | | | 997,000,000 | |
Debt instrument, interest rate, stated percentage | 2.70% | | | | | |
Debt instrument, maturity date | Apr. 1, 2023 | | | | | |
3.75% Senior notes due February 2024 | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Frequency of interest payment | Semi-annually on February 15 and August 15 | | | | | |
Debt instrument, face amount | $ 1,100,000,000 | | | | | |
Senior notes | $ 1,095,000,000 | | | | 1,094,000,000 | |
Debt instrument, interest rate, stated percentage | 3.75% | | | | | |
Debt instrument, maturity date | Feb. 15, 2024 | | | | | |
3.35% Senior notes due September 2025 | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Frequency of interest payment | Semi-annually on March 15 and September 15 | | | | | |
Debt instrument, face amount | $ 1,000,000,000 | | | | | |
Senior notes | $ 996,000,000 | | | | 995,000,000 | |
Debt instrument, interest rate, stated percentage | 3.35% | | | | | |
Debt instrument, maturity date | Sep. 15, 2025 | | | | | |
3.00% Senior notes due April 2026 | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Frequency of interest payment | Semi-annually on April 1 and October 1 | | | | | |
Debt instrument, face amount | $ 1,300,000,000 | | | | | |
Senior notes | $ 1,290,000,000 | | | | 1,288,000,000 | |
Debt instrument, interest rate, stated percentage | 3.00% | | | | | |
Debt instrument, maturity date | Apr. 1, 2026 | | | | | |
2.125% Senior notes due September 2026 | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Frequency of interest payment | Semi-annually on March 15 and September 15 | | | | | |
Debt instrument, face amount | $ 1,000,000,000 | | | | | |
Senior notes | $ 989,000,000 | | | | 987,000,000 | |
Debt instrument, interest rate, stated percentage | 2.125% | | | | | |
Debt instrument, maturity date | Sep. 15, 2026 | | | | | |
2.80% Senior notes due September 2027 | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Frequency of interest payment | Semi-annually on March 14 and September 14 | | | | | |
Debt instrument, face amount | $ 1,000,000,000 | | | | | |
Senior notes | $ 1,007,000,000 | | | | 981,000,000 | |
Debt instrument, interest rate, stated percentage | 2.80% | | | | | |
Debt instrument, maturity date | Sep. 14, 2027 | | | | | |
3.90% Senior notes due December 2028 | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Frequency of interest payment | Semi-annually on June 6 and December 6 | | | | | |
Debt instrument, face amount | $ 1,000,000,000 | | | | | |
Senior notes | $ 1,059,000,000 | | | | 1,005,000,000 | |
Debt instrument, interest rate, stated percentage | 3.90% | | | | | |
Debt instrument, maturity date | Dec. 6, 2028 | | | | | |
Unamortized discount | $ 7,000,000 | | | | | |
2.95% Senior notes due June 2029 | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Frequency of interest payment | Semi-annually on June 15 and December 15 | | | | | |
Debt instrument, face amount | $ 1,750,000,000 | $ 1,800,000,000 | $ 1,000,000,000 | | | |
Senior notes | $ 1,797,000,000 | | | | 0 | |
Debt instrument, interest rate, stated percentage | 2.95% | | 2.95% | | | |
Debt instrument, maturity date | Jun. 15, 2029 | | | | | |
Unamortized discount | $ 6,000,000 | | | | | |
5.875% Senior notes due December 2036 | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Frequency of interest payment | Semi-annually on June 16 and December 16 | | | | | |
Debt instrument, face amount | $ 3,000,000,000 | | | | | |
Senior notes | $ 2,953,000,000 | | | | 2,951,000,000 | |
Debt instrument, interest rate, stated percentage | 5.875% | | | | | |
Debt instrument, maturity date | Dec. 16, 2036 | | | | | |
5.40% Senior notes due September 2040 | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Frequency of interest payment | Semi-annually on March 15 and September 15 | | | | | |
Debt instrument, face amount | $ 500,000,000 | | | | | |
Senior notes | $ 495,000,000 | | | | 495,000,000 | |
Debt instrument, interest rate, stated percentage | 5.40% | | | | | |
Debt instrument, maturity date | Sep. 15, 2040 | | | | | |
5.95% Senior notes due April 2041 | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Frequency of interest payment | Semi-annually on April 1 and October 1 | | | | | |
Debt instrument, face amount | $ 1,000,000,000 | | | | | |
Senior notes | $ 989,000,000 | | | | 989,000,000 | |
Debt instrument, interest rate, stated percentage | 5.95% | | | | | |
Debt instrument, maturity date | Apr. 1, 2041 | | | | | |
4.20% Senior notes due April 2043 | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Frequency of interest payment | Semi-annually on April 1 and October 1 | | | | | |
Debt instrument, face amount | $ 1,000,000,000 | | | | | |
Senior notes | $ 989,000,000 | | | | 989,000,000 | |
Debt instrument, interest rate, stated percentage | 4.20% | | | | | |
Debt instrument, maturity date | Apr. 1, 2043 | | | | | |
4.875% Senior notes due February 2044 | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Frequency of interest payment | Semi-annually on February 15 and August 15 | | | | | |
Debt instrument, face amount | $ 1,000,000,000 | | | | | |
Senior notes | $ 979,000,000 | | | | 979,000,000 | |
Debt instrument, interest rate, stated percentage | 4.875% | | | | | |
Debt instrument, maturity date | Feb. 15, 2044 | | | | | |
4.40% Senior notes due March 2045 | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Frequency of interest payment | Semi-annually on March 15 and September 15 | | | | | |
Debt instrument, face amount | $ 1,000,000,000 | | | | | |
Senior notes | $ 978,000,000 | | | | 977,000,000 | |
Debt instrument, interest rate, stated percentage | 4.40% | | | | | |
Debt instrument, maturity date | Mar. 15, 2045 | | | | | |
4.25% Senior notes due April 2046 | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Frequency of interest payment | Semi-annually on April 1 and October 1 | | | | | |
Debt instrument, face amount | $ 1,600,000,000 | | | | | |
Senior notes | $ 1,585,000,000 | | | | 1,585,000,000 | |
Debt instrument, interest rate, stated percentage | 4.25% | | | | | |
Debt instrument, maturity date | Apr. 1, 2046 | | | | | |
3.90% Senior notes due June 2047 | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Frequency of interest payment | Semi-annually June 15 and September 15 | | | | | |
Debt instrument, face amount | $ 1,150,000,000 | | | $ 1,200,000,000 | | $ 750,000,000 |
Senior notes | $ 1,144,000,000 | | | | 738,000,000 | |
Debt instrument, interest rate, stated percentage | 3.90% | | | | | 3.90% |
Unamortized premium | $ 10,000,000 | | | | | |
Debt instrument, maturity date | Jun. 15, 2047 | | | | | |
June 2019 Issuance | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Debt issuance costs, gross | $ 10,000,000 | | | | | |
4.50% Senior notes due December 2048 | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Frequency of interest payment | Semi-annually on June 6 and December 6 | | | | | |
Debt instrument, face amount | $ 1,500,000,000 | | | | | |
Senior notes | $ 1,462,000,000 | | | | 1,462,000,000 | |
Debt instrument, interest rate, stated percentage | 4.50% | | | | | |
Debt instrument, maturity date | Dec. 6, 2048 | | | | | |
Unamortized discount | $ 25,000,000 | | | | | |
3.125% Senior notes due December 2049 | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Frequency of interest payment | Semi-annually om June 15 and December 15 | | | | | |
Debt instrument, face amount | $ 1,250,000,000 | | | | | |
Senior notes | $ 1,221,000,000 | | | | 0 | |
Debt instrument, interest rate, stated percentage | 3.125% | | | | | |
Debt instrument, maturity date | Dec. 15, 2049 | | | | | |
Unamortized discount | $ 16,000,000 | | | | | |
2.95% senior notes due june 2029, first tranche | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Debt instrument, face amount | 750,000,000 | | | | | |
Unamortized premium | 32,000,000 | | | | | |
January 2020 Issuance | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Debt issuance costs, gross | 17,000,000 | | | | | |
Senior notes due june 15, 2047, second tranche | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Debt instrument, face amount | 400,000,000 | | | | | |
December 2018 Issuance | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Debt issuance costs, gross | $ 22,000,000 | | | | | |
3.50% Senior notes due September 2056 | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Frequency of interest payment | Semi-annually on March 15 and September 15 | | | | | |
Debt instrument, face amount | $ 1,000,000,000 | | | | | |
Senior notes | $ 972,000,000 | | | | $ 972,000,000 | |
Debt instrument, interest rate, stated percentage | 3.50% | | | | | |
Debt instrument, maturity date | Sep. 15, 2056 | | | | | |
London Interbank Offered Rate (LIBOR) | Floating rate senior notes due March 2022 | | | | | | |
Debt Instrument [Line Items] | | | | | | |
Debt instrument, basis spread on variable rate | 0.31% | | | | | |