Debt (Debt With A Contractual Term Greater Than One Year) (Detail) - USD ($) $ in Thousands	Jun. 26, 2016	Dec. 31, 2015	Jun. 28, 2015
Debt Instrument [Line Items]
Gross long-term debt	$ 6,040,836	$ 5,670,818	$ 6,096,039
Less: current portion of long-term debt, net of unamortized discount and issuance costs	(732,773)	(838,349)	(1,544,956)
Long-term debt, net	5,308,063	4,832,469	4,551,083
Secured Debt
Debt Instrument [Line Items]
Less: unamortized discount and debt issuance costs	(2,386)	(3,777)	(5,618)
Gross long-term debt	1,236,557	1,613,216	2,172,401
Secured Debt | Asset-backed Canadian commercial paper conduit facility
Debt Instrument [Line Items]
Long-term debt, gross	161,626	153,839	160,940
Secured Debt | Term asset-backed securitization debt
Debt Instrument [Line Items]
Long-term debt, gross	1,077,317	1,463,154	2,017,079
Unsecured Debt
Debt Instrument [Line Items]
Less: unamortized discount and debt issuance costs	(24,429)	(21,106)	(14,320)
Unsecured Debt | 1.15% Medium-term notes due in 2015 par value
Debt Instrument [Line Items]
Long-term debt, gross	$ 0	$ 0	$ 600,000
Debt instrument, stated percentage	1.15%	1.15%	1.15%
Unsecured Debt | 3.88% Medium-term notes due in 2016 par value
Debt Instrument [Line Items]
Long-term debt, gross	$ 0	$ 450,000	$ 450,000
Debt instrument, stated percentage	3.88%	3.88%	3.88%
Unsecured Debt | 2.70% Medium-term notes due in 2017 par value
Debt Instrument [Line Items]
Long-term debt, gross	$ 400,000	$ 400,000	$ 400,000
Debt instrument, stated percentage	2.70%	2.70%	2.70%
Unsecured Debt | 1.55% Medium-term notes due in 2017 par value
Debt Instrument [Line Items]
Long-term debt, gross	$ 400,000	$ 400,000	$ 400,000
Debt instrument, stated percentage	1.55%	1.55%	1.55%
Unsecured Debt | 6.80% Medium-term notes due in 2018 par value
Debt Instrument [Line Items]
Long-term debt, gross	$ 878,708	$ 878,708	$ 887,958
Debt instrument, stated percentage	6.80%	6.80%	6.80%
Unsecured Debt | 2.40% Medium-term notes due in 2019 par value
Debt Instrument [Line Items]
Long-term debt, gross	$ 600,000	$ 600,000	$ 600,000
Debt instrument, stated percentage	2.40%	2.40%	2.40%
Unsecured Debt | 2.25% Medium-term notes due in 2019 par value
Debt Instrument [Line Items]
Long-term debt, gross	$ 600,000	$ 0	$ 0
Debt instrument, stated percentage	2.25%	2.25%	2.25%
Unsecured Debt | 2.15% Medium-term notes due in 2020 par value
Debt Instrument [Line Items]
Long-term debt, gross	$ 600,000	$ 600,000	$ 600,000
Debt instrument, stated percentage	2.15%	2.15%	2.15%
Unsecured Debt | 2.85% Medium-term notes due in 2021 par value
Debt Instrument [Line Items]
Long-term debt, gross	$ 600,000	$ 0	$ 0
Debt instrument, stated percentage	2.85%	2.85%	2.85%
Unsecured Debt | 3.50% Senior unsecured notes due in 2025 par value
Debt Instrument [Line Items]
Long-term debt, gross	$ 450,000	$ 450,000	$ 0
Debt instrument, stated percentage	3.50%	3.50%	3.50%
Unsecured Debt | 4.625% Senior unsecured notes due in 2045 par value
Debt Instrument [Line Items]
Long-term debt, gross	$ 300,000	$ 300,000	$ 0
Debt instrument, stated percentage	4.625%	4.625%	4.625%