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Partnership Capital - Roll Forward of Outstanding Partnership Loans (Detail) - USD ($)
$ in Millions
 6 Months Ended
Jun. 29, 2018
Jun. 30, 2017
Partners Capital Notes [Abstract]    
Partnership loans outstanding at beginning of period $ 297 $ 266
Partnership loans issued during the period 168 142
Repayment of Partnership loans during the period (112) (93)
Partnership loans outstanding at end of period $ 353 $ 315