Common Shares, Treasury Shares, Reserves and Dividends - Share Repurchase (Details) - USD ($)	12 Months Ended
	Feb. 02, 2019	Feb. 03, 2018	Jan. 28, 2017	Jun. 30, 2017	Aug. 31, 2016	Feb. 29, 2016
Class of Stock [Line Items]
Shares repurchased (shares)	8,800,000	8,100,000	11,200,000
Amount repurchased	$ 485,000,000	$ 460,000,000	$ 1,000,000,000
Average repurchase price per share (usd per share)	$ 55.06	$ 56.91	$ 89.10
2017 Program
Class of Stock [Line Items]
Amount authorized	$ 600,000,000			$ 600,000,000
Shares repurchased (shares)	7,537,062
Amount repurchased	$ 434,400,000
Average repurchase price per share (usd per share)	$ 57.64
Remaining authorized repurchase amount	$ 165,600,000
2016 Program
Class of Stock [Line Items]
Amount authorized	$ 1,375,000,000				$ 625,000,000	$ 750,000,000
Shares repurchased (shares)	1,272,176	8,082,630	10,004,333
Amount repurchased	$ 50,600,000	$ 460,000,000	$ 864,400,000
Average repurchase price per share (usd per share)	$ 39.76	$ 56.91	$ 86.40
2013 Program
Class of Stock [Line Items]
Amount authorized	$ 350,000,000
Shares repurchased (shares)			1,218,621
Amount repurchased			$ 135,600,000
Average repurchase price per share (usd per share)			$ 111.26