Earnings Per Share - Additional Information (Detail) - USD ($)		1 Months Ended	3 Months Ended				9 Months Ended		12 Months Ended
	Nov. 17, 2016	Dec. 31, 2013	Sep. 30, 2017	Jul. 01, 2017	Dec. 31, 2016	Oct. 01, 2016	Sep. 30, 2017	Oct. 01, 2016	Dec. 31, 2016	Dec. 28, 2013
Stockholders Equity Note [Line Items]
Option Indexed to Issuer's Equity, Strike Price			$ 162.21	$ 162.27			$ 179.47
Equity Unit				$ 750,000,000						$ 345,000,000
Preferred Stock, Liquidation Preference, Value				$ 750,000,000
Preferred Stock Conversion Rate Number Of Common Stock Shares			$ 6.1649	$ 6.1627
Mandatory Convertible Equity Units		$ 345,000,000
Document Period End Date							Sep. 30, 2017
Long-term Debt			$ 750,000,000		$ 345,000,000	$ 345.0
Common Stock, Par or Stated Value Per Share			$ 2.50		$ 2.50		$ 2.50		$ 2.50
Equity Units Conversion Rate Number Of Common Stock Shares			0.7244	0.7241
Common Stock, Shares, Issued	3,504,165		176,902,738		176,902,738		176,902,738		176,902,738
Minimum [Member]
Stockholders Equity Note [Line Items]
Option Indexed to Issuer's Equity, Strike Price			$ 162.21	$ 162.27
Maximum [Member]
Stockholders Equity Note [Line Items]
Option Indexed to Issuer's Equity, Strike Price			$ 179.47	$ 179.53
Stock Options [Member]
Stockholders Equity Note [Line Items]
Antidilutive securities excluded from the computation of EPS			2,000			0	388,000	854,000
Notes 2 Point 25 Percent due 2018 [Member]
Stockholders Equity Note [Line Items]
Common Stock, Par or Stated Value Per Share					$ 100				$ 100
Convertible Notes Payable Four Point Two Five Percent Due Twenty Eighteen [Member]
Stockholders Equity Note [Line Items]
Convertible Preferred Stock Shares Issuable Upon Conversion	3,504,165
Common Stock [Member]
Stockholders Equity Note [Line Items]
Equity Units Conversion Rate Number Of Common Stock Shares	1.0157
Common Stock [Member] | Minimum [Member]
Stockholders Equity Note [Line Items]
Equity Units Conversion Rate Number Of Common Stock Shares									1.0122	1.0122
Common Stock [Member] | Maximum [Member]
Stockholders Equity Note [Line Items]
Equity Units Conversion Rate Number Of Common Stock Shares									1.2399	1.2399