Schedule I - Condensed Statements of Cash Flow (Detail) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 27, 2019	Jun. 28, 2019	Mar. 29, 2019	Dec. 31, 2018	Sep. 28, 2018	Jun. 29, 2018	Mar. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
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	$ 285	$ 281	$ 285	$ 241	$ 244	$ 273	$ 240	$ 233	1,092	990	872
Changes in assets and liabilities:
Other assets									(14)	(14)	0
Accounts payable and accrued expenses									47	26	4
Net cash provided by (used in) operating activities									13	1,138	(244)
CASH FLOWS FROM FINANCING ACTIVITIES:
Issuance of partnership interests									432	60	80
Redemption of partnership interests									(216)	(199)	(193)
Distributions from partnership capital									(783)	(694)	(598)
Net cash used in financing activities									(567)	(833)	(711)
Net (decrease) increase in cash, cash equivalents and restricted cash									(730)	200	(1,035)
CASH AND CASH EQUIVALENTS:
Beginning of year								8,537	8,737	8,537	9,572
End of year	8,007				8,737				8,007	8,737	8,537
NON-CASH ACTIVITIES:
Issuance of general partnership interests through partnership loans in current year									164	170	142
Repayment of partnership loans through distributions from partnership capital in current year									136	135	111
Declared distributions for retired partnership capital in current year but unpaid at year end									113	97	0
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									1,092	990	872
Changes in assets and liabilities:
Investment in subsidiaries									(513)	(134)	(312)
Investment securities									5	0	2
Other assets									(16)	(14)	0
Accounts payable and accrued expenses									1	1	1
Net cash provided by (used in) operating activities									569	843	563
CASH FLOWS FROM FINANCING ACTIVITIES:
Issuance of partnership interests									432	60	80
Redemption of partnership interests									(216)	(199)	(193)
Distributions from partnership capital									(783)	(694)	(598)
Net cash used in financing activities									(567)	(833)	(711)
Net (decrease) increase in cash, cash equivalents and restricted cash									2	10	(148)
CASH AND CASH EQUIVALENTS:
Beginning of year								$ 308	318	308	456
End of year	$ 320				$ 318				320	318	308
NON-CASH ACTIVITIES:
Issuance of general partnership interests through partnership loans in current year									164	170	142
Repayment of partnership loans through distributions from partnership capital in current year									136	135	111
Declaration of distributions from subsidiary in current year but received after year end									428	56	129
Declared distributions for retired partnership capital in current year but unpaid at year end									$ 109	$ 97	$ 0