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INVESTMENTS - Amortized Cost, Gross Unrealized Gains and Losses, Fair Values of Investments (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Debt Securities
Amortized Cost	$ 444	$ 341
Gross Unrealized Gains	7	1
Gross Unrealized Losses	0	0
Fair Value	451	342
Asset-backed securities
Debt Securities
Amortized Cost	24	30
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	24	30
Corporate bonds
Debt Securities
Amortized Cost	126	123
Gross Unrealized Gains	2	1
Gross Unrealized Losses	0	0
Fair Value	128	124
U.S. government agencies and government-sponsored agencies
Debt Securities
Amortized Cost	27	14
Gross Unrealized Gains	1	0
Gross Unrealized Losses	0	0
Fair Value	28	14
U.S. treasuries
Debt Securities
Amortized Cost	261	163
Gross Unrealized Gains	4	0
Gross Unrealized Losses	0	0
Fair Value	265	163
Certificates of deposit
Debt Securities
Amortized Cost	0	1
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	0	1
Other debt securities
Debt Securities
Amortized Cost	6	10
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	$ 6	$ 10

X

- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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