Repurchase of Common Stock (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		1 Months Ended	3 Months Ended		6 Months Ended
		Sep. 05, 2018	Aug. 04, 2018	Jul. 29, 2017	Aug. 04, 2018	Jul. 29, 2017	Mar. 01, 2018	Mar. 01, 2017	Feb. 27, 2017	Jun. 30, 2011
Total Share Repurchases [Domain]
Stock Repurchases [Line Items]
Stock Repurchased and Retired During Period, Value		$ 135
Stock Repurchased and Retired During Period, Shares		1.7
Open market [Domain]
Stock Repurchases [Line Items]
Stock Repurchased and Retired During Period, Value	[1]		$ 375	$ 397	$ 774	$ 781
Treasury Stock Acquired, Average Cost Per Share			$ 74.80	$ 55.07	$ 73.21	$ 50.38
Stock Repurchased and Retired During Period, Shares	[1]		5.0	7.2	10.6	15.5
Unsettled shares, cost			$ 13	$ 18	$ 13	$ 18
Unsettled shares, shares			0.2	0.3	0.2	0.3
February 2017 share repurchase program [Member]
Stock Repurchases [Line Items]
Stock Repurchase Program, Authorized Amount									$ 5,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount			$ 2,300		$ 2,300
June 2011 share repurchase program [Member}
Stock Repurchases [Line Items]
Stock Repurchase Program, Authorized Amount										$ 5,000
Scenario, Plan [Member]
Stock Repurchases [Line Items]
Stock Repurchase Program, Authorized Amount							$ 1,500
Scenario, Plan [Member] | Adjusted Balance [Member]
Stock Repurchases [Line Items]
Stock Repurchase Program, Authorized Amount							$ 3,500	$ 3,000

[1] As of August 4, 2018, $13 million, or 0.2 million shares, in trades remained unsettled. As of July 29, 2017, $18 million, or 0.3 million shares, in trades remained unsettled. The liability for unsettled trades is included in Accrued liabilities on our Condensed Consolidated Balance Sheets.