Annual report pursuant to Section 13 and 15(d)

INVESTMENTS AND RESTRICTED CASH - Additional Information (Detail)

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INVESTMENTS AND RESTRICTED CASH - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Gain (Loss) on Securities [Line Items]      
Marketable securities pledged as collateral $ 389,000,000 $ 587,000,000  
Debt Securities, Trading, and Equity Securities, FV-NI 114,000,000 139,000,000  
Gross realized gains on sales of marketable securities 8,000,000    
Gross realized losses on sales of marketable securities 2,000,000 4,000,000 $ 2,000,000
Impairment charge 0 0 $ 0
Investments and Restricted Cash 24,000,000 170,000,000  
Variable Life Insurance Policy [Member]      
Gain (Loss) on Securities [Line Items]      
Investments and Restricted Cash 21,000,000 19,000,000  
cash held in escrow [Member]      
Gain (Loss) on Securities [Line Items]      
Restricted Cash and Cash Equivalents, Noncurrent $ 3,000,000 $ 9,000,000  
Measurement Input, Discount Rate [Member]      
Gain (Loss) on Securities [Line Items]      
Weighted average discount rate 7.40% 8.16%