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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
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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

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