Partnership Capital - Roll Forward of Outstanding Partnership Loans (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 30, 2018	Mar. 31, 2017
Partners Capital Notes [Abstract]
Partnership loans outstanding at beginning of period	$ 297	$ 266
Partnership loans issued during the period	168	140
Repayment of Partnership loans during the period	(84)	(71)
Partnership loans outstanding at end of period	$ 381	$ 335