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Debt (Narrative) (Details) - USD ($) $ in Millions							8 Months Ended	12 Months Ended
	Sep. 14, 2017	Jun. 05, 2017	Sep. 06, 2016	Mar. 01, 2016	Feb. 12, 2016	May 28, 2015	Sep. 15, 2017	Jan. 28, 2018
Debt Instrument [Line Items]
Redemption price percentage								100.00%
Change of control redemption price percentage								101.00%
2.80% Senior Notes due September 14, 2027 [Member]
Debt Instrument [Line Items]
Face amount	$ 1,000
Stated interest rate percentage	2.80%
Maturity date	Sep. 14, 2027
Unamortized discount	$ 3
Debt issuance costs	$ 6
Frequency of periodic payment	semi-annually on March 14 and September 14
Floating Rate Senior Notes due September 15, 2017 [Member]
Debt Instrument [Line Items]
Maturity date							Sep. 15, 2017
Frequency of periodic payment							quarterly on March 15, June 15, September 15 and December 15
Floating Rate Senior Notes due June 5, 2020 [Member]
Debt Instrument [Line Items]
Face amount		$ 500
Maturity date		Jun. 05, 2020
Frequency of periodic payment		quarterly on March 5, June 5, September 5, and December 5
1.80% Senior Notes due June 5, 2020 [Member]
Debt Instrument [Line Items]
Face amount		$ 750
Stated interest rate percentage		1.80%
Maturity date		Jun. 05, 2020
Unamortized discount		$ 1
Frequency of periodic payment		semi-annually on June 5 and December 5
3.90% Senior Notes due June 15, 2047 [Member]
Debt Instrument [Line Items]
Face amount		$ 750
Stated interest rate percentage		3.90%
Maturity date		Jun. 15, 2047
Unamortized discount		$ 5
Frequency of periodic payment		semi-annually on June 15 and December 15
2.125% Senior Notes due September 15, 2026 [Member]
Debt Instrument [Line Items]
Face amount			$ 1,000
Stated interest rate percentage			2.125%
Maturity date			Sep. 15, 2026
Unamortized discount			$ 11
Frequency of periodic payment			semi-annually on March 15 and September 15
3.5% Senior Notes due September 15, 2056 [Member]
Debt Instrument [Line Items]
Face amount			$ 1,000
Stated interest rate percentage			3.50%
Maturity date			Sep. 15, 2056
Unamortized discount			$ 19
Frequency of periodic payment			semi-annually on March 15 and September 15
2.00% Senior Notes due April 1, 2021 [Member]
Debt Instrument [Line Items]
Face amount					$ 1,350
Stated interest rate percentage					2.00%
Maturity date					Apr. 01, 2021
Unamortized discount					$ 5
Frequency of periodic payment					semi-annually on April 1 and October 1
3.00% Senior Notes due April 1, 2026 [Member]
Debt Instrument [Line Items]
Face amount					$ 1,300
Stated interest rate percentage					3.00%
Maturity date					Apr. 01, 2026
Unamortized discount					$ 8
Frequency of periodic payment					semi-annually on April 1 and October 1
Additional 4.25 Senior Notes Due April 1, 2046 [Member]
Debt Instrument [Line Items]
Face amount					$ 350
Stated interest rate percentage					4.25%
Maturity date					Apr. 01, 2046
Unamortized premium					$ 2
Frequency of periodic payment					semi-annually on April 1 and October 1
Original 4.25% Senior Notes Due April 1, 2046 [Member]
Debt Instrument [Line Items]
Face amount						$ 1,250
Stated interest rate percentage						4.25%
Maturity date						Apr. 01, 2046
4.25% Senior Notes due April 1, 2046 [Member]
Debt Instrument [Line Items]
Face amount					$ 1,600
Maturity date					Apr. 01, 2046
5.40% Senior Notes Due March 1, 2016 [Member]
Debt Instrument [Line Items]
Stated interest rate percentage				5.40%
Maturity date				Mar. 01, 2016
2.25% Senior Notes due September 10, 2018 [Member]
Debt Instrument [Line Items]
Stated interest rate percentage								2.25%
Maturity date								Sep. 10, 2018
Frequency of periodic payment								semi-annually on March 10 and September 10
2.00% Senior Notes due June 15, 2019 [Member]
Debt Instrument [Line Items]
Stated interest rate percentage								2.00%
Maturity date								Jun. 15, 2019
Frequency of periodic payment								semi-annually on June 15 and December 15
3.95% Senior Notes due September 15, 2020 [Member]
Debt Instrument [Line Items]
Stated interest rate percentage								3.95%
Maturity date								Sep. 15, 2020
Frequency of periodic payment								semi-annually on March 15 and September 15
4.40% Senior Notes due April 1, 2021 [Member]
Debt Instrument [Line Items]
Stated interest rate percentage								4.40%
Maturity date								Apr. 01, 2021
Frequency of periodic payment								semi-annually on April 1 and October 1
2.625% Senior Notes due June 1, 2022 [Member]
Debt Instrument [Line Items]
Stated interest rate percentage								2.625%
Maturity date								Jun. 01, 2022
Frequency of periodic payment								semi-annually June 1 and December 1
2.70% Senior Notes due April 1, 2023 [Member]
Debt Instrument [Line Items]
Stated interest rate percentage								2.70%
Maturity date								Apr. 01, 2023
Frequency of periodic payment								semi-annually on April 1 and October 1
3.75% Senior Notes due February 15, 2024 [Member]
Debt Instrument [Line Items]
Stated interest rate percentage								3.75%
Maturity date								Feb. 15, 2024
Frequency of periodic payment								semi-annually on February 15 and August 15
3.35% Senior Notes due September 15, 2025 [Member]
Debt Instrument [Line Items]
Stated interest rate percentage								3.35%
Maturity date								Sep. 15, 2025
Frequency of periodic payment								semi-annually on March 15 and September 15
5.875% Senior Notes due December 16, 2036 [Member]
Debt Instrument [Line Items]
Stated interest rate percentage								5.875%
Maturity date								Dec. 16, 2036
Frequency of periodic payment								semi-annually on June 16 and December 16
5.40% Senior Notes due September 15, 2040 [Member]
Debt Instrument [Line Items]
Stated interest rate percentage								5.40%
Maturity date								Sep. 15, 2040
Frequency of periodic payment								semi-annually on March 15 and September 15
5.95% Senior Notes due April 1, 2041 [Member]
Debt Instrument [Line Items]
Stated interest rate percentage								5.95%
Maturity date								Apr. 01, 2041
Frequency of periodic payment								semi-annually on April 1 and October 1
4.20% Senior Notes due April 1, 2043 [Member]
Debt Instrument [Line Items]
Stated interest rate percentage								4.20%
Maturity date								Apr. 01, 2043
Frequency of periodic payment								semi-annually on April 1 and October 1
4.875% Senior Notes due February 15, 2044 [Member]
Debt Instrument [Line Items]
Stated interest rate percentage								4.875%
Maturity date								Feb. 15, 2044
Frequency of periodic payment								semi-annually on February 15 and August 15
4.40% Senior Notes due March 15, 2045 [Member]
Debt Instrument [Line Items]
Stated interest rate percentage								4.40%
Maturity date								Mar. 15, 2045
Frequency of periodic payment								semi-annually on March 15 and September 15
June 2017 Issuance [Member]
Debt Instrument [Line Items]
Debt issuance costs		$ 12
September 2016 Issuance [Member]
Debt Instrument [Line Items]
Debt issuance costs			$ 16
February 2016 Issuance [Member]
Debt Instrument [Line Items]
Debt issuance costs					$ 17
London Interbank Offered Rate (LIBOR) [Member] | Floating Rate Senior Notes due September 15, 2017 [Member]
Debt Instrument [Line Items]
Basis spread on variable rate							0.37%
London Interbank Offered Rate (LIBOR) [Member] | Floating Rate Senior Notes due June 5, 2020 [Member]
Debt Instrument [Line Items]
Basis spread on variable rate		0.15%

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