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INVESTMENTS - Amortized Cost, Gross Unrealized Gains and Losses, Fair Values of Investments (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Debt Securities    
Amortized Cost $ 538 $ 444
Gross Unrealized Gains 2 7
Gross Unrealized Losses (2) 0
Fair Value 538 451
Asset-backed securities    
Debt Securities    
Amortized Cost 49 24
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 49 24
Corporate bonds    
Debt Securities    
Amortized Cost 167 126
Gross Unrealized Gains 1 2
Gross Unrealized Losses (1) 0
Fair Value 167 128
U.S. government agencies and government-sponsored agencies    
Debt Securities    
Amortized Cost 17 27
Gross Unrealized Gains 0 1
Gross Unrealized Losses 0 0
Fair Value 17 28
U.S. treasuries    
Debt Securities    
Amortized Cost 285 261
Gross Unrealized Gains 1 4
Gross Unrealized Losses (1) 0
Fair Value 285 265
Certificate of deposit    
Debt Securities    
Amortized Cost 11 0
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value 11 0
Other debt securities    
Debt Securities    
Amortized Cost 9 6
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Fair Value $ 9 $ 6