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Stockholders' Equity (Accelerated Share Repurchases) (Details) - USD ($) shares in Millions, $ in Millions	1 Months Ended						2 Months Ended					3 Months Ended			5 Months Ended	6 Months Ended		12 Months Ended
	Jul. 30, 2017	Jul. 11, 2017	Jan. 31, 2016	Jan. 05, 2016	May 03, 2015	Apr. 15, 2015	Jan. 28, 2018	Nov. 16, 2017	Jul. 30, 2017	Jan. 31, 2016	May 03, 2015	Jan. 31, 2016	Nov. 01, 2015	Aug. 02, 2015	Jan. 28, 2018	Jan. 31, 2016	Nov. 01, 2015	Jan. 28, 2018	Jan. 29, 2017	Jan. 31, 2016
Accelerated Share Repurchases [Line Items]
Cash paid for repurchases of common stock																		$ 8,000	$ 6,880	$ 7,000
Repurchases of common stock through accelerated share agreements																		49.0	53.0	59.0
Q1 Accelerated Share Repurchase Agreement [Member]
Accelerated Share Repurchases [Line Items]
Cash paid for repurchases of common stock											$ 850
Repurchases of common stock through accelerated share agreements					0.5	7.0					7.5
Q2 Accelerated Share Repurchase Agreement [Member]
Accelerated Share Repurchases [Line Items]
Cash paid for repurchases of common stock									$ 1,650								$ 1,500
Repurchases of common stock through accelerated share agreements	1.1	9.7							10.8				1.3	12.0			13.3
Q3 Accelerated Share Repurchase Agreement [Member]
Accelerated Share Repurchases [Line Items]
Cash paid for repurchases of common stock															$ 1,200	$ 1,375
Repurchases of common stock through accelerated share agreements							0.7	6.7				1.3	10.1		7.4	11.4
Q4 Accelerated Share Repurchase Agreement [Member]
Accelerated Share Repurchases [Line Items]
Cash paid for repurchases of common stock										$ 1,500
Repurchases of common stock through accelerated share agreements			1.7	9.7						11.4