Annual report pursuant to Section 13 and 15(d)

INVESTMENTS AND RESTRICTED CASH - Age of Gross Unrealized Losses and Fair Value by Investment Category (Detail)

v3.20.4
INVESTMENTS AND RESTRICTED CASH - Age of Gross Unrealized Losses and Fair Value by Investment Category (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
Gain (Loss) on Securities [Line Items]  
Less Than 12 Months Fair Value $ 47
Less Than 12 Months Unrealized Losses 0
12 Months or More Fair Value 1
12 Months or More Unrealized Losses 0
Total Fair Value 48
Total Unrealized Losses 0
U.S. government and agency debt securities  
Gain (Loss) on Securities [Line Items]  
Less Than 12 Months Fair Value 31
Less Than 12 Months Unrealized Losses 0
12 Months or More Fair Value 0
12 Months or More Unrealized Losses 0
Total Fair Value 31
Total Unrealized Losses 0
Mortgage and asset-backed debt securities  
Gain (Loss) on Securities [Line Items]  
Less Than 12 Months Fair Value 0
Less Than 12 Months Unrealized Losses 0
12 Months or More Fair Value 1
12 Months or More Unrealized Losses 0
Total Fair Value 1
Total Unrealized Losses 0
Corporate debt securities  
Gain (Loss) on Securities [Line Items]  
Less Than 12 Months Fair Value 16
Less Than 12 Months Unrealized Losses 0
12 Months or More Fair Value 0
12 Months or More Unrealized Losses 0
Total Fair Value 16
Total Unrealized Losses 0
Non-U.S. government debt securities  
Gain (Loss) on Securities [Line Items]  
Less Than 12 Months Fair Value 0
Less Than 12 Months Unrealized Losses 0
12 Months or More Fair Value 0
12 Months or More Unrealized Losses 0
Total Fair Value 0
Total Unrealized Losses $ 0