Schedule of Debt (Detail) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 26, 2015
Debt Instrument [Line Items]
Total	$ 29	$ 51
Total	358	628
Recourse Debt
Debt Instrument [Line Items]
Capital lease obligations	146	169
Other	12	12
Total	358	628
Recourse Debt \| 7.35% debentures, due 2016
Debt Instrument [Line Items]
Capital lease obligations	27	29
Long term debt		18
Other current maturities of long-term debt	2	4
Total	29	51
Recourse Debt \| Senior Secured Notes, due 2019
Debt Instrument [Line Items]
Long term debt		250
Unamortized debt issuance cost		(3)
Senior Secured Notes, due 2019, net		247
Recourse Debt \| Revenue bonds, due in varying amounts periodically through 2029
Debt Instrument [Line Items]
Long term debt	186	186
Recourse Debt \| American & Foreign Power Company, Inc. 5% debentures, due 2030
Debt Instrument [Line Items]
Long term debt	14	14
Non-Recourse Debt
Debt Instrument [Line Items]
Long term debt	735	735
Unamortized premium	63	84
Senior Secured Notes, due 2019, net	$ 798	$ 819

Amount of capital lease obligation due within one year or the normal operating cycle, if longer.

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