Annual report pursuant to Section 13 and 15(d)

CASH AND INVESTMENTS - Additional Information (Detail)

v3.6.0.2
CASH AND INVESTMENTS - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Gain (Loss) on Investments [Line Items]      
Marketable securities pledged as collateral $ 572,000,000 $ 564,000,000  
Trading Securities 517,000,000 1,429,000,000  
Gross realized gains on sales of marketable securities 1,000,000 1,000,000 $ 1,000,000
Gross realized losses on sales of marketable securities 1,000,000 1,000,000 0
Impairment charge 0 0 $ 0
Investments and Restricted Cash $ 476,000,000 $ 473,000,000  
Weighted average discount rate 8.06% 8.22%  
Variable Life Insurance Policy [Member]      
Gain (Loss) on Investments [Line Items]      
Investments and Restricted Cash $ 18,000,000 $ 19,000,000  
Self Insurance Program [Member]      
Gain (Loss) on Investments [Line Items]      
Investments and Restricted Cash 445,000,000 442,000,000  
cash held in escrow [Member]      
Gain (Loss) on Investments [Line Items]      
Investments and Restricted Cash $ 13,000,000 $ 12,000,000