Capital Stock (Narrative) (Details) - USD ($) $ / shares in Units, shares in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2015	Sep. 30, 2016	Oct. 02, 2014
Option Indexed to Issuer's Equity [Line Items]
Increase In Stock Repurchase Program Authorization				$ 5,000,000,000
Repurchase and retirement of common stock, shares	10.4
Call Option [Member]
Option Indexed to Issuer's Equity [Line Items]
Repurchase and retirement of common stock, shares	2.1
Average strike price	$ 135.03
Put Option [Member]
Option Indexed to Issuer's Equity [Line Items]
Repurchase and retirement of common stock, shares	0.7
Average strike price	$ 143.89
Options indexed to issuer's equity, shares	5.3
Options expired unexercised	4.6
Equity Unit Purchase Agreements [Member]
Option Indexed to Issuer's Equity [Line Items]
Equity Units Issued		25.0
Equity Units, outstanding principal amount			$ 1,000
Long-term Debt, Gross			$ 1,250,000,000