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)

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INVESTMENTS AND RESTRICTED CASH - Age of Gross Unrealized Losses and Fair Value by Investment Category (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2019
USD ($)
Gain (Loss) on Securities [Line Items]  
Less Than 12 Months Fair Value $ 60
Less Than 12 Months Unrealized Losses 0
12 Months or More Fair Value 9
12 Months or More Unrealized Losses 0
Total Fair Value 69
Total Unrealized Losses 0
U.S. government and agency debt securities  
Gain (Loss) on Securities [Line Items]  
Less Than 12 Months Fair Value 42
Less Than 12 Months Unrealized Losses 0
12 Months or More Fair Value 0
12 Months or More Unrealized Losses 0
Total Fair Value 42
Total Unrealized Losses 0
Mortgage and asset-backed debt securities  
Gain (Loss) on Securities [Line Items]  
Less Than 12 Months Fair Value 3
Less Than 12 Months Unrealized Losses 0
12 Months or More Fair Value 5
12 Months or More Unrealized Losses 0
Total Fair Value 8
Total Unrealized Losses 0
Corporate debt securities  
Gain (Loss) on Securities [Line Items]  
Less Than 12 Months Fair Value 6
Less Than 12 Months Unrealized Losses 0
12 Months or More Fair Value 2
12 Months or More Unrealized Losses 0
Total Fair Value 8
Total Unrealized Losses 0
Non-U.S. government debt securities  
Gain (Loss) on Securities [Line Items]  
Less Than 12 Months Fair Value 9
Less Than 12 Months Unrealized Losses 0
12 Months or More Fair Value 2
12 Months or More Unrealized Losses 0
Total Fair Value 11
Total Unrealized Losses $ 0