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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
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Dec. 31, 2021 USD ($)
Gain (Loss) on Securities [Line Items] |
Less Than 12 Months Fair Value | $ 200
Less Than 12 Months Unrealized Losses | 1
12 Months or More Fair Value | 75
12 Months or More Unrealized Losses | 0
Total Fair Value | 275
Total Unrealized Losses | 1
U.S. government and agency debt securities |
Gain (Loss) on Securities [Line Items] |
Less Than 12 Months Fair Value | 145
Less Than 12 Months Unrealized Losses | 1
12 Months or More Fair Value | 55
12 Months or More Unrealized Losses | 0
Total Fair Value | 200
Total Unrealized Losses | 1
Mortgage and asset-backed 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 | 0
12 Months or More Unrealized Losses | 0
Total Fair Value | 6
Total Unrealized Losses | 0
Corporate debt securities |
Gain (Loss) on Securities [Line Items] |
Less Than 12 Months Fair Value | 44
Less Than 12 Months Unrealized Losses | 0
12 Months or More Fair Value | 20
12 Months or More Unrealized Losses | 0
Total Fair Value | 64
Total Unrealized Losses | 0
U.S. state and local municipal debt securities |
Gain (Loss) on Securities [Line Items] |
Less Than 12 Months Fair Value | 5
Less Than 12 Months Unrealized Losses | 0
12 Months or More Fair Value | 0
12 Months or More Unrealized Losses | 0
Total Fair Value | 5
Total Unrealized Losses | $ 0

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