Pension Plans, Postretirement and Other Employee Benefits - Additional Information (Detail) $ in Millions		3 Months Ended		12 Months Ended
	Jan. 02, 2012 retirement_plan	Dec. 31, 2015 USD ($) retiree	Sep. 30, 2015	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Pension and Other Postretirement Benefits Disclosure [Line Items]
Pension benefit obligations		$ 841		$ 841
Pension benefit obligations with funding requirements		770		770
Pension Fund assets available to fund pension benefit obligations		657		657
Pension benefit obligations with no funding requirements		71		$ 71
Acceptable tolerance limit of investment allocations for securities				5.00%
Employer contributions				$ 25
Expected contributions in 2013				$ 15
Defined Benefit Plan, Other Information				21
Minimum retirement age for eligible employees of the post retirement plans				55 years
Minimum years of service for eligible employees of the post retirement plans				10 years
Prior period correction		$ 11
Defined Benefit Plan, Prior Period Adjustment, Number of Retirees Entitled to Benefits Not Included | retiree		170
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate				7.00%	6.50%	7.00%
Defined Benefit Plan Ultimate Health Care Cost Year Five				4.50%	4.50%	4.50%
Retirement Savings Plan | retirement_plan	1
Maximum percentage of salary deferral allowed under the Employee Stock Ownership Plans		75.00%		75.00%
Defined Compensation Plan, Amended Employee Match Percentage on One Hundred Percent of Employee Contributions				3.00%
Defined Compensation Plan, Amended Employee Match Percentage on Fifty Percent of Employee Contributions				50.00%
Expense recorded relating to employee matching contribution				$ 27	$ 25	$ 23
Maximum [Member]
Pension and Other Postretirement Benefits Disclosure [Line Items]
Defined Compensation Plan, Amended Employee Match Percentage on Fifty Percent of Employee Contributions				5.00%
Postretirement
Pension and Other Postretirement Benefits Disclosure [Line Items]
Employer contributions				$ 9	8
Percent of eligible employees who participated in voluntary buyout, more than			60.00%
Defined Benefit Plan, Other Information				50
Prior period correction				$ 0	$ 15
One percentage point increase effect on postretirement benefit obligation				15
One percentage point decrease effect on postretirement benefit obligation				13
Postretirement | Maximum [Member]
Pension and Other Postretirement Benefits Disclosure [Line Items]
Defined benefit plan effect of one percentage point increase on service and interest cost components				1
Defined benefit plan effect of one percentage point decrease on service and interest cost components				$ 1
Postretirement | Minimum [Member]
Pension and Other Postretirement Benefits Disclosure [Line Items]
Defined Compensation Plan, Amended Employee Match Percentage on One Hundred Percent of Employee Contributions				100.00%
Defined Compensation Plan, Amended Employee Match Percentage on Fifty Percent of Employee Contributions				3.00%
Pension Plans, Defined Benefit
Pension and Other Postretirement Benefits Disclosure [Line Items]
Expected contributions in 2013				$ 9
Equity Securities
Pension and Other Postretirement Benefits Disclosure [Line Items]
Targeted pension plan allocations in debt securities				70.00%
Debt Securities
Pension and Other Postretirement Benefits Disclosure [Line Items]
Targeted pension plan allocations in debt securities				30.00%