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Debt (Narrative) (Details) - USD ($) $ in Millions |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Sep. 06, 2016 | Mar. 01, 2016 | Feb. 12, 2016 | Sep. 15, 2015 | May 28, 2015 | Jan. 29, 2017 | Jan. 31, 2016 | Feb. 01, 2015
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Redemption Price of Long-Term Debt |  |  |  |  |  | 100.00% |  |
Change of Control Redemption Price of Long-Term Debt |  |  |  |  |  | 101.00% |  |
Interest Costs Incurred [Abstract] |  |  |  |  |  |  |  |
Interest Capitalized |  |  |  |  |  | $ 1 | $ 2 | $ 2
Maturities of Long-Term Debt [Abstract] |  |  |  |  |  |  |  |
Maturities of Long-Term Debt for 2017 |  |  |  |  |  | 542 |  |
Maturities of Long-Term Debt for 2018 |  |  |  |  |  | 1,200 |  |
Maturities of Long-Term Debt for 2019 |  |  |  |  |  | 1,000 |  |
Maturities of Long-Term Debt for 2020 |  |  |  |  |  | 573 |  |
Maturities of Long-Term Debt for 2021 |  |  |  |  |  | 2,400 |  |
Maturities of Long-Term Debt for fiscal years thereafter |  |  |  |  |  | $ 17,200 |  |
2.125% Senior Notes Due September 15, 2026 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Face Amount of Long-Term Debt | $ 1,000 |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 2.125% |  |  |  |  | 2.125% |  |
Maturity Date of Long-Term Debt | Sep. 15, 2026 |  |  |  |  |  |  |
Unamortized Discount of Long-Term Debt | $ 11 |  |  |  |  |  |  |
Frequency of Periodic Payment of Long-Term Debt | semi-annually on March 15 and September 15 |  |  |  |  |  |  |
3.5% Senior Notes Due September 15, 2056 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Face Amount of Long-Term Debt | $ 1,000 |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 3.50% |  |  |  |  | 3.50% |  |
Maturity Date of Long-Term Debt | Sep. 15, 2056 |  |  |  |  |  |  |
Unamortized Discount of Long-Term Debt | $ 19 |  |  |  |  |  |  |
Frequency of Periodic Payment of Long-Term Debt | semi-annually on March 15 and September 15 |  |  |  |  |  |  |
2.00% Senior Notes Due April 1, 2021 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Face Amount of Long-Term Debt |  |  | $ 1,350 |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 2.00% |  |  | 2.00% |  |
Maturity Date of Long-Term Debt |  |  | Apr. 01, 2021 |  |  |  |  |
Unamortized Discount of Long-Term Debt |  |  | $ 5 |  |  |  |  |
Frequency of Periodic Payment of Long-Term Debt |  |  | semi-annually on April 1 and October 1 |  |  |  |  |
3.00% Senior Notes Due April 1, 2026 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Face Amount of Long-Term Debt |  |  | $ 1,300 |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 3.00% |  |  | 3.00% |  |
Maturity Date of Long-Term Debt |  |  | Apr. 01, 2026 |  |  |  |  |
Unamortized Discount of Long-Term Debt |  |  | $ 8 |  |  |  |  |
Frequency of Periodic Payment of Long-Term Debt |  |  | semi-annually on April 1 and October 1 |  |  |  |  |
Additional 4.25 Senior Notes Due April 1, 2046 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Face Amount of Long-Term Debt |  |  | $ 350 |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  | 4.25% |  |  |  |  |
Maturity Date of Long-Term Debt |  |  | Apr. 01, 2046 |  |  |  |  |
Debt Instrument, Unamortized Premium |  |  | $ 2 |  |  |  |  |
Frequency of Periodic Payment of Long-Term Debt |  |  | semi-annually on April 1 and October 1 |  |  |  |  |
4.25% Senior Notes Due April 1, 2046 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Face Amount of Long-Term Debt |  |  | $ 1,600 |  | $ 1,250 |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 4.25% | 4.25% |  |
Maturity Date of Long-Term Debt |  |  |  |  | Apr. 01, 2046 |  |  |
Unamortized Discount of Long-Term Debt |  |  |  |  | $ 3 |  |  |
Frequency of Periodic Payment of Long-Term Debt |  |  |  |  | semi-annually on April 1 and October 1 |  |  |
5.40% Senior Notes Due March 1, 2016 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 5.40% |  |  |  |  |  |
Maturity Date of Long-Term Debt |  | Mar. 01, 2016 |  |  |  |  |  |
Floating Rate Senior Notes Due September 15, 2017 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Face Amount of Long-Term Debt |  |  |  | $ 500 |  |  |  |
Maturity Date of Long-Term Debt |  |  |  | Sep. 15, 2017 |  |  |  |
Frequency of Periodic Payment of Long-Term Debt |  |  |  | quarterly on March 15, June 15, September 15 and December 15 |  |  |  |
3.35% Senior Notes Due September 15, 2025 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Face Amount of Long-Term Debt |  |  |  | $ 1,000 |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 3.35% |  | 3.35% |  |
Maturity Date of Long-Term Debt |  |  |  | Sep. 15, 2025 |  |  |  |
Unamortized Discount of Long-Term Debt |  |  |  | $ 1 |  |  |  |
Frequency of Periodic Payment of Long-Term Debt |  |  |  | semi-annually on March 15 and September 15 |  |  |  |
2.625% Senior Notes Due June 1, 2022 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Face Amount of Long-Term Debt |  |  |  |  | $ 1,250 |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 2.625% | 2.625% |  |
Maturity Date of Long-Term Debt |  |  |  |  | Jun. 01, 2022 |  |  |
Unamortized Discount of Long-Term Debt |  |  |  |  | $ 5 |  |  |
Frequency of Periodic Payment of Long-Term Debt |  |  |  |  | semi-annually on June 1 and December 1 |  |  |
2.25% Senior Notes Due September 10, 2018 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  | 2.25% |  |
Maturity Date of Long-Term Debt |  |  |  |  |  | Sep. 10, 2018 |  |
Frequency of Periodic Payment of Long-Term Debt |  |  |  |  |  | semi-annually on March 10 and September 10 |  |
2.00% Senior Notes Due June 15, 2019 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  | 2.00% |  |
Maturity Date of Long-Term Debt |  |  |  |  |  | Jun. 15, 2019 |  |
Frequency of Periodic Payment of Long-Term Debt |  |  |  |  |  | semi-annually on June 15 and December 15 |  |
3.95% Senior Notes Due September 15, 2020 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  | 3.95% |  |
Maturity Date of Long-Term Debt |  |  |  |  |  | Sep. 15, 2020 |  |
Frequency of Periodic Payment of Long-Term Debt |  |  |  |  |  | semi-annually on March 15 and September 15 |  |
4.40% Senior Notes Due April 1, 2021 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  | 4.40% |  |
Maturity Date of Long-Term Debt |  |  |  |  |  | Apr. 01, 2021 |  |
Frequency of Periodic Payment of Long-Term Debt |  |  |  |  |  | semi-annually on April 1 and October 1 |  |
2.70% Senior Notes Due April 1, 2023 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  | 2.70% |  |
Maturity Date of Long-Term Debt |  |  |  |  |  | Apr. 01, 2023 |  |
Frequency of Periodic Payment of Long-Term Debt |  |  |  |  |  | semi-annually on April 1 and October 1 |  |
3.75% Senior Notes Due February 15, 2024 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  | 3.75% |  |
Maturity Date of Long-Term Debt |  |  |  |  |  | Feb. 15, 2024 |  |
Frequency of Periodic Payment of Long-Term Debt |  |  |  |  |  | semi-annually on February 15 and August 15 |  |
5.875% Senior Notes Due December 16, 2036 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  | 5.875% |  |
Maturity Date of Long-Term Debt |  |  |  |  |  | Dec. 16, 2036 |  |
Frequency of Periodic Payment of Long-Term Debt |  |  |  |  |  | semi-annually on June 16 and December 16 |  |
5.40% Senior Notes Due September 15, 2040 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  | 5.40% |  |
Maturity Date of Long-Term Debt |  |  |  |  |  | Sep. 15, 2040 |  |
Frequency of Periodic Payment of Long-Term Debt |  |  |  |  |  | semi-annually on March 15 and September 15 |  |
5.95% Senior Notes Due April 1, 2041 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  | 5.95% |  |
Maturity Date of Long-Term Debt |  |  |  |  |  | Apr. 01, 2041 |  |
Frequency of Periodic Payment of Long-Term Debt |  |  |  |  |  | semi-annually on April 1 and October 1 |  |
4.20% Senior Notes Due April 1, 2043 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  | 4.20% |  |
Maturity Date of Long-Term Debt |  |  |  |  |  | Apr. 01, 2043 |  |
Frequency of Periodic Payment of Long-Term Debt |  |  |  |  |  | semi-annually on April 1 and October 1 |  |
4.875% Senior Notes Due February 15, 2044 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  | 4.875% |  |
Maturity Date of Long-Term Debt |  |  |  |  |  | Feb. 15, 2044 |  |
Frequency of Periodic Payment of Long-Term Debt |  |  |  |  |  | semi-annually on February 15 and August 15 |  |
4.40% Senior Notes Due March 15, 2045 [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  | 4.40% |  |
Maturity Date of Long-Term Debt |  |  |  |  |  | Mar. 15, 2045 |  |
Frequency of Periodic Payment of Long-Term Debt |  |  |  |  |  | semi-annually on March 15 and September 15 |  |
September 2016 Issuance [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Unamortized Discount of Long-Term Debt | $ 30 |  |  |  |  |  |  |
Debt Issuance Costs, Gross | $ 16 |  |  |  |  |  |  |
February 2016 Issuance [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Unamortized Premium |  |  | 2 |  |  |  |  |
Unamortized Discount of Long-Term Debt |  |  | 13 |  |  |  |  |
Debt Issuance Costs, Gross |  |  | $ 17 |  |  |  |  |
September 2015 Issuance [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Issuance Costs, Gross |  |  |  | $ 7 |  |  |  |
May 2015 Issuance [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Unamortized Discount of Long-Term Debt |  |  |  |  | $ 8 |  |  |
Debt Issuance Costs, Gross |  |  |  |  | $ 19 |  |  |

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