Annual report pursuant to Section 13 and 15(d)

INVESTMENTS AND RESTRICTED CASH - Additional Information (Detail)

v3.20.4
INVESTMENTS AND RESTRICTED CASH - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Gain (Loss) on Securities [Line Items]      
Marketable securities pledged as collateral $ 404 $ 389  
Debt Securities, Trading, and Equity Securities, FV-NI 2 114  
Gross realized gains on sales of marketable securities 5 8 $ 0
Gross realized losses on sales of marketable securities 0 2 4
Impairment charge 0 0 $ 0
Investments and Restricted Cash 25 24  
Variable Life Insurance Policy [Member]      
Gain (Loss) on Securities [Line Items]      
Investments and Restricted Cash 23 21  
cash held in escrow [Member]      
Gain (Loss) on Securities [Line Items]      
Restricted Cash and Cash Equivalents, Noncurrent $ 2 $ 3