Borrowing Facilities and Debt (Narrative) (Details) - USD ($)	1 Months Ended
	Nov. 30, 2015	Oct. 30, 2016	Oct. 25, 2015	Sep. 30, 2015	Oct. 30, 2011
Line of Credit Facility [Line Items]
Available revolving credit agreement		$ 1,600,000,000.0
Amount outstanding		0	$ 0
Commercial paper program amount					$ 1,500,000,000
Long-term debt		3,150,000,000	3,350,000,000
Short term debt principal amount		200,000,000	1,200,000,000
Outstanding commercial paper		200,000,000	1,200,000,000
Senior Notes
Line of Credit Facility [Line Items]
Long-term debt				$ 1,800,000,000
Senior Notes | 2.650% Senior Notes Due 2016
Line of Credit Facility [Line Items]
Short term debt principal amount		$ 0	$ 400,000,000
Stated interest rate		2.65%	2.65%
Repurchase amount	$ 405,000,000
Loss on repurchase of debt instrument	$ 5,000,000
Other Debt
Line of Credit Facility [Line Items]
Short term debt principal amount		$ 0	$ 800,000,000
Commercial paper, corporate bonds and medium-term notes
Line of Credit Facility [Line Items]
Outstanding commercial paper		0	$ 0
Revolving Credit
Line of Credit Facility [Line Items]
Available revolving credit agreement		1,500,000,000.0
Foreign Line of Credit
Line of Credit Facility [Line Items]
Available revolving credit agreement		$ 77,000,000