Schedule I - Condensed Statements of Cash Flow (Detail) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 25, 2015	Jun. 26, 2015	Mar. 27, 2015	Dec. 31, 2014	Sep. 26, 2014	Jun. 27, 2014	Mar. 28, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income									$ 0	$ 0	$ 0
Adjustments to reconcile net income to net cash provided by operating activities:
Income before allocations to partners	$ 194	$ 208	$ 222	$ 214	$ 195	$ 195	$ 194	$ 186	838	770	674
Changes in assets and liabilities:
Other assets										(33)	4
Accounts payable and accrued expenses									19	20	(11)
Net cash provided by operating activities									444	1,206	709
CASH FLOWS FROM FINANCING ACTIVITIES:
Issuance of partnership interests (net of partnership loans)									352	55	40
Redemption of partnership interests									(161)	(125)	(115)
Distributions from partnership capital (net of partnership loans)									(637)	(563)	(490)
Issuance of partnership loans											(11)
Net cash used in financing activities									(446)	(683)	(626)
Net (decrease) increase in cash and cash equivalents									(96)	433	(1)
CASH AND CASH EQUIVALENTS:
Beginning of year				1,033				600	1,033	600	601
End of year	937				1,033				937	1,033	600
NON-CASH ACTIVITIES:
Issuance of general partnership interests through partnership loans in current period									119	86	95
Repayment of partnership loans through distributions from partnership capital in current period									99	103	61
Parent Company [Member]
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income									0	0	0
Adjustments to reconcile net income to net cash provided by operating activities:
Income before allocations to partners									838	770	674
Changes in assets and liabilities:
Investment securities									0	0	4
Investment in subsidiaries									(179)	(267)	(136)
Other assets									0	(3)	0
Accounts payable and accrued expenses									(1)	0	1
Net cash provided by operating activities									658	500	543
CASH FLOWS FROM FINANCING ACTIVITIES:
Issuance of partnership interests (net of partnership loans)									352	55	40
Redemption of partnership interests									(161)	(125)	(115)
Distributions from partnership capital (net of partnership loans)									(637)	(563)	(490)
Issuance of partnership loans									0	0	(11)
Net cash used in financing activities									(446)	(633)	(576)
Net (decrease) increase in cash and cash equivalents									212	(133)	(33)
CASH AND CASH EQUIVALENTS:
Beginning of year				$ 119				$ 252	119	252	285
End of year	$ 331				$ 119				331	119	252
NON-CASH ACTIVITIES:
Issuance of general partnership interests through partnership loans in current period									119	86	95
Repayment of partnership loans through distributions from partnership capital in current period									$ 99	$ 103	$ 61