Summary of Capped Call (Equity Options) Issued (Detail) (USD $)	0 Months Ended	1 Months Ended	3 Months Ended		12 Months Ended	1 Months Ended
	Feb. 10, 2015	Dec. 31, 2013	Apr. 04, 2015	Mar. 29, 2014	Dec. 28, 2013	Nov. 30, 2010	Jan. 03, 2015
Option Indexed to Issuer's Equity [Line Items]
Long-term Debt			$ 4,355,000,000				$ 4,323,800,000
Convertible Preferred Stock Shares Issuable Upon Conversion					6,100,000
Net Premium Paid		9,700,000
Common Stock, Par or Stated Value Per Share			$ 2.50				$ 2.50
Payments for Repurchase of Common Stock	326,100,000		348,000,000	19,400,000
Common Stock, Shares, Issued			176,906,265				176,906,265
Stock Exercise Price Per Share Percentage Greater Than Closing Price							$ 0.4
Treasury Stock Acquired, Average Cost Per Share	$ 96.46		$ 112.84
Call Option [Member]
Option Indexed to Issuer's Equity [Line Items]
Original Number of Options	9,100,000.0				12,200,000.0
Option Indexed to Issuer's Equity, Aggregate Fair Value			28,300,000
Minimum [Member]
Option Indexed to Issuer's Equity [Line Items]
Common Stock, Shares, Issued							3,500,000
Stock Exercise Price Per Share							$ 98.80
Maximum [Member]
Option Indexed to Issuer's Equity [Line Items]
Common Stock, Shares, Issued							4,300,000
Stock Exercise Price Per Share							$ 112.91
Capped call (equity options)
Option Indexed to Issuer's Equity [Line Items]
Net Premium Paid						50,300,000
Common Stock Price Per Share					2.77	$ 5.97
Open Option Contracts Written, at Fair Value			15,600,000
Notes 2 Point 25 Percent due 2018 [Member]
Option Indexed to Issuer's Equity [Line Items]
Long-term Debt							345,000,000
Common Stock, Par or Stated Value Per Share							$ 100.00
Convertible Notes Payable Four Point Two Five Percent Due Twenty Eighteen [Member]
Option Indexed to Issuer's Equity [Line Items]
Long-term Debt						632,500,000
Common Stock [Member]
Option Indexed to Issuer's Equity [Line Items]
Equity Units Conversion Rate Number Of Common Stock Shares			1.0128
Conversion price of convertible note (in dollars per share)			$ 98.73
Common Stock [Member] | Minimum [Member]
Option Indexed to Issuer's Equity [Line Items]
Equity Units Conversion Rate Number Of Common Stock Shares					1.0122
Payments for Repurchase of Common Stock					98.80
Common Stock [Member] | Maximum [Member]
Option Indexed to Issuer's Equity [Line Items]
Equity Units Conversion Rate Number Of Common Stock Shares					1.2399
Payments for Repurchase of Common Stock					80.65
Convertible Preferred Stock [Member]
Option Indexed to Issuer's Equity [Line Items]
Conversion price of convertible note (in dollars per share)			$ 72.94			$ 75.00
Convertible Notes Conversion Rate Number Of Common Stock Shares			1.3709			1.3333
Conversion of Stock, Shares Issued					3,500,000.0	8,433,123
Convertible Preferred Stock [Member] | Maximum [Member]
Option Indexed to Issuer's Equity [Line Items]
Convertible Notes Conversion Rate Number Of Common Stock Shares							1.2399